77464840981 has 4 divisors (see below), whose sum is σ = 84507099264. Its totient is φ = 70422582700.

The previous prime is 77464840963. The next prime is 77464840991. The reversal of 77464840981 is 18904846477.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77464840981 - 2²¹ = 77462743829 is a prime.

It is a super-2 number, since 2×77464840981² (a number of 23 digits) 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 (77464840951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3521129125 + ... + 3521129146.

It is an arithmetic number, because the mean of its divisors is an integer number (21126774816).

Almost surely, 2^77464840981 is an apocalyptic number.

It is an amenable number.

77464840981 is a deficient number, since it is larger than the sum of its proper divisors (7042258283).

77464840981 is a wasteful number, since it uses less digits than its factorization.

77464840981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7042258282.

The product of its (nonzero) digits is 10838016, while the sum is 58.

The spelling of 77464840981 in words is "seventy-seven billion, four hundred sixty-four million, eight hundred forty thousand, nine hundred eighty-one".