61616511550 has 48 divisors (see below), whose sum is σ = 125980043904. Its totient is φ = 22234940000.

The previous prime is 61616511533. The next prime is 61616511553. The reversal of 61616511550 is 5511561616.

61616511550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61616511553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 355546 + ... + 499645.

It is an arithmetic number, because the mean of its divisors is an integer number (2624584248).

Almost surely, 2^61616511550 is an apocalyptic number.

61616511550 is an abundant number, since it is smaller than the sum of its proper divisors (64363532354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61616511550 is a wasteful number, since it uses less digits than its factorization.

61616511550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855345 (or 855340 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 61616511550 in words is "sixty-one billion, six hundred sixteen million, five hundred eleven thousand, five hundred fifty".