61540257868 has 24 divisors (see below), whose sum is σ = 108086770400. Its totient is φ = 30658497408.

The previous prime is 61540257827. The next prime is 61540257871. The reversal of 61540257868 is 86875204516.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1438288 + ... + 1480456.

Almost surely, 2^61540257868 is an apocalyptic number.

It is an amenable number.

61540257868 is a deficient number, since it is larger than the sum of its proper divisors (46546512532).

61540257868 is a wasteful number, since it uses less digits than its factorization.

61540257868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43489 (or 43487 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 52.

The spelling of 61540257868 in words is "sixty-one billion, five hundred forty million, two hundred fifty-seven thousand, eight hundred sixty-eight".