9561403622400 has 3168 divisors, whose sum is σ = 41892585369600. Its totient is φ = 1877055897600.

The previous prime is 9561403622371. The next prime is 9561403622453. The reversal of 9561403622400 is 42263041659.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 121030425561 + ... + 121030425639.

Almost surely, 2^{9561403622400} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9561403622400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20946292684800).

9561403622400 is an abundant number, since it is smaller than the sum of its proper divisors (32331181747200).

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

9561403622400 is a wasteful number, since it uses less digits than its factorization.

9561403622400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 9561403622400 in words is "nine trillion, five hundred sixty-one billion, four hundred three million, six hundred twenty-two thousand, four hundred".