77540072621 has 32 divisors (see below), whose sum is σ = 86958835200. Its totient is φ = 68546450880.

The previous prime is 77540072587. The next prime is 77540072627. The reversal of 77540072621 is 12627004577.

It is a cyclic number.

It is not a de Polignac number, because 77540072621 - 2⁶ = 77540072557 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 (77540072627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24012035 + ... + 24015263.

It is an arithmetic number, because the mean of its divisors is an integer number (2717463600).

Almost surely, 2^77540072621 is an apocalyptic number.

It is an amenable number.

77540072621 is a deficient number, since it is larger than the sum of its proper divisors (9418762579).

77540072621 is a wasteful number, since it uses less digits than its factorization.

77540072621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3689.

The product of its (nonzero) digits is 164640, while the sum is 41.

The spelling of 77540072621 in words is "seventy-seven billion, five hundred forty million, seventy-two thousand, six hundred twenty-one".