625643621541 has 32 divisors (see below), whose sum is σ = 984944926080. Its totient is φ = 391143437568.

The previous prime is 625643621513. The next prime is 625643621543. The reversal of 625643621541 is 145126346526.

625643621541 is a `hidden beast` number, since 6 + 2 + 5 + 6 + 43 + 62 + 1 + 541 = 666.

It is not a de Polignac number, because 625643621541 - 2¹³ = 625643613349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625643621543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2333251 + ... + 2587536.

It is an arithmetic number, because the mean of its divisors is an integer number (30779528940).

Almost surely, 2^625643621541 is an apocalyptic number.

It is an amenable number.

625643621541 is a deficient number, since it is larger than the sum of its proper divisors (359301304539).

625643621541 is a wasteful number, since it uses less digits than its factorization.

625643621541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4921090 (or 4921084 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The spelling of 625643621541 in words is "six hundred twenty-five billion, six hundred forty-three million, six hundred twenty-one thousand, five hundred forty-one".