77651211660 has 48 divisors (see below), whose sum is σ = 237189157632. Its totient is φ = 18824536000.

The previous prime is 77651211647. The next prime is 77651211667. The reversal of 77651211660 is 6611215677.

It is a super-2 number, since 2×77651211660² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77651211667) 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, 58826016 + ... + 58827335.

It is an arithmetic number, because the mean of its divisors is an integer number (4941440784).

Almost surely, 2^77651211660 is an apocalyptic number.

It is an amenable number.

77651211660 is an abundant number, since it is smaller than the sum of its proper divisors (159537945972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77651211660 is a wasteful number, since it uses less digits than its factorization.

77651211660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117653374 (or 117653372 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 77651211660 in words is "seventy-seven billion, six hundred fifty-one million, two hundred eleven thousand, six hundred sixty".