61442925021 has 12 divisors (see below), whose sum is σ = 93421991520. Its totient is φ = 38806057800.

The previous prime is 61442925017. The next prime is 61442925041. The reversal of 61442925021 is 12052924416.

It is a happy number.

61442925021 is a `hidden beast` number, since 6 + 144 + 2 + 9 + 2 + 502 + 1 = 666.

61442925021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61442925021 - 2² = 61442925017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61442925001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179657505 + ... + 179657846.

It is an arithmetic number, because the mean of its divisors is an integer number (7785165960).

Almost surely, 2^61442925021 is an apocalyptic number.

It is an amenable number.

61442925021 is a deficient number, since it is larger than the sum of its proper divisors (31979066499).

61442925021 is a wasteful number, since it uses less digits than its factorization.

61442925021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359315376 (or 359315373 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 61442925021 in words is "sixty-one billion, four hundred forty-two million, nine hundred twenty-five thousand, twenty-one".