77769510641 has 16 divisors (see below), whose sum is σ = 84014040000. Its totient is φ = 71763039936.

The previous prime is 77769510629. The next prime is 77769510647. The reversal of 77769510641 is 14601596777.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77769510641 is a prime.

It is a super-2 number, since 2×77769510641² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77769510647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196046 + ... + 440423.

It is an arithmetic number, because the mean of its divisors is an integer number (5250877500).

Almost surely, 2^77769510641 is an apocalyptic number.

It is an amenable number.

77769510641 is a deficient number, since it is larger than the sum of its proper divisors (6244529359).

77769510641 is a wasteful number, since it uses less digits than its factorization.

77769510641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636656.

The product of its (nonzero) digits is 2222640, while the sum is 53.

The spelling of 77769510641 in words is "seventy-seven billion, seven hundred sixty-nine million, five hundred ten thousand, six hundred forty-one".