42561520951 has 2 divisors, whose sum is σ = 42561520952. Its totient is φ = 42561520950.

The previous prime is 42561520919. The next prime is 42561521029. The reversal of 42561520951 is 15902516524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42561520951 - 2⁵ = 42561520919 is a prime.

It is a super-2 number, since 2×42561520951² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42561520901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21280760475 + 21280760476.

It is an arithmetic number, because the mean of its divisors is an integer number (21280760476).

Almost surely, 2^42561520951 is an apocalyptic number.

42561520951 is a deficient number, since it is larger than the sum of its proper divisors (1).

42561520951 is an equidigital number, since it uses as much as digits as its factorization.

42561520951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 42561520951 in words is "forty-two billion, five hundred sixty-one million, five hundred twenty thousand, nine hundred fifty-one".