77703697981 has 8 divisors (see below), whose sum is σ = 95635320704. Its totient is φ = 61479848880.

The previous prime is 77703697963. The next prime is 77703698011. The reversal of 77703697981 is 18979630777.

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 77703697981 - 2⁹ = 77703697469 is a prime.

It is a super-2 number, since 2×77703697981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77703697901) 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, 426943305 + ... + 426943486.

It is an arithmetic number, because the mean of its divisors is an integer number (11954415088).

Almost surely, 2^77703697981 is an apocalyptic number.

It is an amenable number.

77703697981 is a deficient number, since it is larger than the sum of its proper divisors (17931622723).

77703697981 is a wasteful number, since it uses less digits than its factorization.

77703697981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853886811.

The product of its (nonzero) digits is 28005264, while the sum is 64.

The spelling of 77703697981 in words is "seventy-seven billion, seven hundred three million, six hundred ninety-seven thousand, nine hundred eighty-one".