77931646901 has 8 divisors (see below), whose sum is σ = 80723261880. Its totient is φ = 75146986432.

The previous prime is 77931646873. The next prime is 77931646967. The reversal of 77931646901 is 10964613977.

It can be written as a sum of positive squares in 4 ways, for example, as 16640742001 + 61290904900 = 128999^2 + 247570^2 .

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 77931646901 - 2¹⁸ = 77931384757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77931646601) 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, 1715810 + ... + 1760643.

It is an arithmetic number, because the mean of its divisors is an integer number (10090407735).

Almost surely, 2^77931646901 is an apocalyptic number.

It is an amenable number.

77931646901 is a deficient number, since it is larger than the sum of its proper divisors (2791614979).

77931646901 is a wasteful number, since it uses less digits than its factorization.

77931646901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3477255.

The product of its (nonzero) digits is 1714608, while the sum is 53.

The spelling of 77931646901 in words is "seventy-seven billion, nine hundred thirty-one million, six hundred forty-six thousand, nine hundred one".