61815487512 has 16 divisors (see below), whose sum is σ = 154538718840. Its totient is φ = 20605162496.

The previous prime is 61815487477. The next prime is 61815487523. The reversal of 61815487512 is 21578451816.

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 3 ways as a sum of consecutive naturals, for example, 1287822633 + ... + 1287822680.

Almost surely, 2^61815487512 is an apocalyptic number.

It is an amenable number.

61815487512 is an abundant number, since it is smaller than the sum of its proper divisors (92723231328).

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

61815487512 is a wasteful number, since it uses less digits than its factorization.

61815487512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575645322 (or 2575645318 counting only the distinct ones).

The product of its digits is 537600, while the sum is 48.

The spelling of 61815487512 in words is "sixty-one billion, eight hundred fifteen million, four hundred eighty-seven thousand, five hundred twelve".