61515551070 has 24 divisors (see below), whose sum is σ = 159940433016. Its totient is φ = 16404146928.

The previous prime is 61515551021. The next prime is 61515551087. The reversal of 61515551070 is 7015551516.

It is a happy number.

61515551070 is a `hidden beast` number, since 61 + 5 + 15 + 5 + 510 + 70 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 341752972 + ... + 341753151.

It is an arithmetic number, because the mean of its divisors is an integer number (6664184709).

Almost surely, 2^61515551070 is an apocalyptic number.

61515551070 is an abundant number, since it is smaller than the sum of its proper divisors (98424881946).

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

61515551070 is a wasteful number, since it uses less digits than its factorization.

61515551070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683506136 (or 683506133 counting only the distinct ones).

The product of its (nonzero) digits is 26250, while the sum is 36.

The spelling of 61515551070 in words is "sixty-one billion, five hundred fifteen million, five hundred fifty-one thousand, seventy".