2661666465 has 16 divisors (see below), whose sum is σ = 4261484736. Its totient is φ = 1418616000.

The previous prime is 2661666461. The next prime is 2661666473. The reversal of 2661666465 is 5646661662.

It is a happy number.

It is not a de Polignac number, because 2661666465 - 2² = 2661666461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2661666461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34986 + ... + 80915.

It is an arithmetic number, because the mean of its divisors is an integer number (266342796).

Almost surely, 2^2661666465 is an apocalyptic number.

It is an amenable number.

2661666465 is a deficient number, since it is larger than the sum of its proper divisors (1599818271).

2661666465 is a wasteful number, since it uses less digits than its factorization.

2661666465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117440.

The product of its digits is 1866240, while the sum is 48.

The square root of 2661666465 is about 51591.3409885806. The cubic root of 2661666465 is about 1385.8552698541.

The spelling of 2661666465 in words is "two billion, six hundred sixty-one million, six hundred sixty-six thousand, four hundred sixty-five".