15661022350400 has 84 divisors (see below), whose sum is σ = 44041032169728. Its totient is φ = 5369493373440.

The previous prime is 15661022350387. The next prime is 15661022350411. The reversal of 15661022350400 is 405322016651.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 699141584 + ... + 699163983.

Almost surely, 2^{15661022350400} is an apocalyptic number.

15661022350400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15661022350400 is an abundant number, since it is smaller than the sum of its proper divisors (28380009819328).

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

15661022350400 is a wasteful number, since it uses less digits than its factorization.

15661022350400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398305596 (or 1398305581 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 15661022350400 in words is "fifteen trillion, six hundred sixty-one billion, twenty-two million, three hundred fifty thousand, four hundred".