61515601612 has 24 divisors (see below), whose sum is σ = 108109611792. Its totient is φ = 30627417600.

The previous prime is 61515601573. The next prime is 61515601649. The reversal of 61515601612 is 21610651516.

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 7 ways as a sum of consecutive naturals, for example, 868287 + ... + 936457.

It is an arithmetic number, because the mean of its divisors is an integer number (4504567158).

Almost surely, 2^61515601612 is an apocalyptic number.

It is an amenable number.

61515601612 is a deficient number, since it is larger than the sum of its proper divisors (46594010180).

61515601612 is a wasteful number, since it uses less digits than its factorization.

61515601612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69129 (or 69127 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 61515601612 in words is "sixty-one billion, five hundred fifteen million, six hundred one thousand, six hundred twelve".