42655621507 has 2 divisors, whose sum is σ = 42655621508. Its totient is φ = 42655621506.

The previous prime is 42655621501. The next prime is 42655621523. The reversal of 42655621507 is 70512655624.

42655621507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42655621507 - 2¹⁵ = 42655588739 is a prime.

It is a super-2 number, since 2×42655621507² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42655621501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21327810753 + 21327810754.

It is an arithmetic number, because the mean of its divisors is an integer number (21327810754).

Almost surely, 2^42655621507 is an apocalyptic number.

42655621507 is a deficient number, since it is larger than the sum of its proper divisors (1).

42655621507 is an equidigital number, since it uses as much as digits as its factorization.

42655621507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504000, while the sum is 43.

The spelling of 42655621507 in words is "forty-two billion, six hundred fifty-five million, six hundred twenty-one thousand, five hundred seven".