820977612015 has 32 divisors (see below), whose sum is σ = 1466304212736. Its totient is φ = 388792776960.

The previous prime is 820977612011. The next prime is 820977612023. The reversal of 820977612015 is 510216779028.

It is not a de Polignac number, because 820977612015 - 2² = 820977612011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820977612011) 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, 57848974 + ... + 57863163.

It is an arithmetic number, because the mean of its divisors is an integer number (45822006648).

Almost surely, 2^820977612015 is an apocalyptic number.

820977612015 is a deficient number, since it is larger than the sum of its proper divisors (645326600721).

820977612015 is a wasteful number, since it uses less digits than its factorization.

820977612015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115712199.

The product of its (nonzero) digits is 423360, while the sum is 48.

The spelling of 820977612015 in words is "eight hundred twenty billion, nine hundred seventy-seven million, six hundred twelve thousand, fifteen".