61659573620 has 24 divisors (see below), whose sum is σ = 130050551400. Its totient is φ = 24556125312.

The previous prime is 61659573617. The next prime is 61659573637. The reversal of 61659573620 is 2637595616.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4314650596 + 57344923024 = 65686^2 + 239468^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6726815 + ... + 6735974.

It is an arithmetic number, because the mean of its divisors is an integer number (5418772975).

Almost surely, 2^61659573620 is an apocalyptic number.

It is an amenable number.

61659573620 is an abundant number, since it is smaller than the sum of its proper divisors (68390977780).

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

61659573620 is a wasteful number, since it uses less digits than its factorization.

61659573620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13463027 (or 13463025 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 61659573620 in words is "sixty-one billion, six hundred fifty-nine million, five hundred seventy-three thousand, six hundred twenty".