64161021015 has 48 divisors (see below), whose sum is σ = 136876853568. Its totient is φ = 27074539008.

The previous prime is 64161020947. The next prime is 64161021031. The reversal of 64161021015 is 51012016146.

64161021015 is a `hidden beast` number, since 6 + 41 + 610 + 2 + 1 + 0 + 1 + 5 = 666.

It is not a de Polignac number, because 64161021015 - 2¹² = 64161016919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64161021015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7829974 + ... + 7838163.

It is an arithmetic number, because the mean of its divisors is an integer number (2851601116).

Almost surely, 2^64161021015 is an apocalyptic number.

64161021015 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

64161021015 is an abundant number, since it is smaller than the sum of its proper divisors (72715832553).

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

64161021015 is a wasteful number, since it uses less digits than its factorization.

64161021015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15668168 (or 15668165 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 64161021015 in words is "sixty-four billion, one hundred sixty-one million, twenty-one thousand, fifteen".