15868658640 has 160 divisors (see below), whose sum is σ = 54033684480. Its totient is φ = 3834597888.

The previous prime is 15868658629. The next prime is 15868658671. The reversal of 15868658640 is 4685686851.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29229 + ... + 180531.

It is an arithmetic number, because the mean of its divisors is an integer number (337710528).

Almost surely, 2^15868658640 is an apocalyptic number.

15868658640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15868658640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27016842240).

15868658640 is an abundant number, since it is smaller than the sum of its proper divisors (38165025840).

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

15868658640 is a wasteful number, since it uses less digits than its factorization.

15868658640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151361 (or 151355 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 57.

The spelling of 15868658640 in words is "fifteen billion, eight hundred sixty-eight million, six hundred fifty-eight thousand, six hundred forty".