15942662640 has 240 divisors, whose sum is σ = 55783453440. Its totient is φ = 4075868160.

The previous prime is 15942662621. The next prime is 15942662657. The reversal of 15942662640 is 4626624951.

15942662640 is a `hidden beast` number, since 15 + 9 + 4 + 2 + 6 + 626 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 2429604 + ... + 2436156.

It is an arithmetic number, because the mean of its divisors is an integer number (232431056).

Almost surely, 2^15942662640 is an apocalyptic number.

15942662640 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 15942662640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27891726720).

15942662640 is an abundant number, since it is smaller than the sum of its proper divisors (39840790800).

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

15942662640 is a wasteful number, since it uses less digits than its factorization.

15942662640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6712 (or 6703 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 15942662640 in words is "fifteen billion, nine hundred forty-two million, six hundred sixty-two thousand, six hundred forty".