42615540621 has 6 divisors (see below), whose sum is σ = 61555780910. Its totient is φ = 28410360408.

The previous prime is 42615540613. The next prime is 42615540637. The reversal of 42615540621 is 12604551624.

42615540621 is a `hidden beast` number, since 4 + 26 + 1 + 5 + 5 + 4 + 0 + 621 = 666.

42615540621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 40084444521 + 2531096100 = 200211^2 + 50310^2 .

It is not a de Polignac number, because 42615540621 - 2³ = 42615540613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42615540221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2367530026 + ... + 2367530043.

Almost surely, 2^42615540621 is an apocalyptic number.

It is an amenable number.

42615540621 is a deficient number, since it is larger than the sum of its proper divisors (18940240289).

42615540621 is a wasteful number, since it uses less digits than its factorization.

42615540621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4735060075 (or 4735060072 counting only the distinct ones).

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

The spelling of 42615540621 in words is "forty-two billion, six hundred fifteen million, five hundred forty thousand, six hundred twenty-one".