61660509500 has 48 divisors (see below), whose sum is σ = 134732593632. Its totient is φ = 24652108800.

The previous prime is 61660509461. The next prime is 61660509539. The reversal of 61660509500 is 590506616.

61660509500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61660509461) and next prime (61660509539).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1027319 + ... + 1085681.

It is an arithmetic number, because the mean of its divisors is an integer number (2806929034).

Almost surely, 2^61660509500 is an apocalyptic number.

It is an amenable number.

61660509500 is an abundant number, since it is smaller than the sum of its proper divisors (73072084132).

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

61660509500 is a wasteful number, since it uses less digits than its factorization.

61660509500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60495 (or 60483 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 38.

The spelling of 61660509500 in words is "sixty-one billion, six hundred sixty million, five hundred nine thousand, five hundred".