77251665659381 has 16 divisors (see below), whose sum is σ = 81771481989120. Its totient is φ = 72835628405760.

The previous prime is 77251665659321. The next prime is 77251665659393. The reversal of 77251665659381 is 18395656615277.

It is a cyclic number.

It is not a de Polignac number, because 77251665659381 - 2²⁶ = 77251598550517 is a prime.

It is a super-2 number, since 2×77251665659381² (a number of 29 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 (77251665659321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79346165 + ... + 80313866.

It is an arithmetic number, because the mean of its divisors is an integer number (5110717624320).

Almost surely, 2^{77251665659381} is an apocalyptic number.

It is an amenable number.

77251665659381 is a deficient number, since it is larger than the sum of its proper divisors (4519816329739).

77251665659381 is a wasteful number, since it uses less digits than its factorization.

77251665659381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159660356.

The product of its digits is 571536000, while the sum is 71.

The spelling of 77251665659381 in words is "seventy-seven trillion, two hundred fifty-one billion, six hundred sixty-five million, six hundred fifty-nine thousand, three hundred eighty-one".