61100500550991 has 48 divisors (see below), whose sum is σ = 93480961846272. Its totient is φ = 35405081173440.

The previous prime is 61100500550983. The next prime is 61100500550993. The reversal of 61100500550991 is 19905500500116.

It is not a de Polignac number, because 61100500550991 - 2³ = 61100500550983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61100500550993) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17494185 + ... + 20694141.

It is an arithmetic number, because the mean of its divisors is an integer number (1947520038464).

Almost surely, 2^{61100500550991} is an apocalyptic number.

61100500550991 is a deficient number, since it is larger than the sum of its proper divisors (32380461295281).

61100500550991 is a wasteful number, since it uses less digits than its factorization.

61100500550991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202292 (or 3202281 counting only the distinct ones).

The product of its (nonzero) digits is 60750, while the sum is 42.

The spelling of 61100500550991 in words is "sixty-one trillion, one hundred billion, five hundred million, five hundred fifty thousand, nine hundred ninety-one".