1650540661 has 8 divisors (see below), whose sum is σ = 2057817024. Its totient is φ = 1286135520.

The previous prime is 1650540631. The next prime is 1650540673. The reversal of 1650540661 is 1660450561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1650540661 - 2¹³ = 1650532469 is a prime.

It is a super-2 number, since 2×1650540661² = 5448568947228633842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1650540631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10717720 + ... + 10717873.

It is an arithmetic number, because the mean of its divisors is an integer number (257227128).

Almost surely, 2^1650540661 is an apocalyptic number.

1650540661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1650540661 is a deficient number, since it is larger than the sum of its proper divisors (407276363).

1650540661 is a wasteful number, since it uses less digits than its factorization.

1650540661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21435611.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1650540661 is about 40626.8465549567. The cubic root of 1650540661 is about 1181.7948031579.

The spelling of 1650540661 in words is "one billion, six hundred fifty million, five hundred forty thousand, six hundred sixty-one".