61138995868 has 12 divisors (see below), whose sum is σ = 107162808592. Its totient is φ = 30521050560.

The previous prime is 61138995839. The next prime is 61138995913. The reversal of 61138995868 is 86859983116.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12109005 + ... + 12114052.

Almost surely, 2^61138995868 is an apocalyptic number.

It is an amenable number.

61138995868 is a deficient number, since it is larger than the sum of its proper divisors (46023812724).

61138995868 is a wasteful number, since it uses less digits than its factorization.

61138995868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24223692 (or 24223690 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 64.

The spelling of 61138995868 in words is "sixty-one billion, one hundred thirty-eight million, nine hundred ninety-five thousand, eight hundred sixty-eight".