521642504061 has 64 divisors (see below), whose sum is σ = 901651264000. Its totient is φ = 297941716800.

The previous prime is 521642504039. The next prime is 521642504063. The reversal of 521642504061 is 160405246125.

521642504061 is a `hidden beast` number, since 5 + 2 + 1 + 642 + 5 + 0 + 4 + 0 + 6 + 1 = 666.

It is not a de Polignac number, because 521642504061 - 2¹⁴ = 521642487677 is a prime.

It is a super-2 number, since 2×521642504061² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521642504063) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21667971 + ... + 21692031.

It is an arithmetic number, because the mean of its divisors is an integer number (14088301000).

Almost surely, 2^521642504061 is an apocalyptic number.

It is an amenable number.

521642504061 is a deficient number, since it is larger than the sum of its proper divisors (380008759939).

521642504061 is a wasteful number, since it uses less digits than its factorization.

521642504061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26432 (or 26412 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 521642504061 in words is "five hundred twenty-one billion, six hundred forty-two million, five hundred four thousand, sixty-one".