61911878498 has 18 divisors (see below), whose sum is σ = 96196437441. Its totient is φ = 29883566664.

The previous prime is 61911878491. The next prime is 61911878513. The reversal of 61911878498 is 89487811916.

61911878498 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 61875070009 + 36808489 = 248747^2 + 6067^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=175943.

It is a super-2 number, since 2×61911878498² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61911878498.

It is not an unprimeable number, because it can be changed into a prime (61911878491) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10201661 + ... + 10207727.

Almost surely, 2^61911878498 is an apocalyptic number.

61911878498 is a deficient number, since it is larger than the sum of its proper divisors (34284558943).

61911878498 is an frugal number, since it uses more digits than its factorization.

61911878498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12194 (or 6098 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 62.

The spelling of 61911878498 in words is "sixty-one billion, nine hundred eleven million, eight hundred seventy-eight thousand, four hundred ninety-eight".