61157555566 has 16 divisors (see below), whose sum is σ = 97070146560. Its totient is φ = 28817692920.

The previous prime is 61157555533. The next prime is 61157555603. The reversal of 61157555566 is 66555575116.

It is a congruent 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, 4205856 + ... + 4220371.

It is an arithmetic number, because the mean of its divisors is an integer number (6066884160).

Almost surely, 2^61157555566 is an apocalyptic number.

61157555566 is a deficient number, since it is larger than the sum of its proper divisors (35912590994).

61157555566 is a wasteful number, since it uses less digits than its factorization.

61157555566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8426439.

The product of its digits is 4725000, while the sum is 52.

The spelling of 61157555566 in words is "sixty-one billion, one hundred fifty-seven million, five hundred fifty-five thousand, five hundred sixty-six".