61111511550555 has 32 divisors (see below), whose sum is σ = 97798866645504. Its totient is φ = 32585990950656.

The previous prime is 61111511550527. The next prime is 61111511550569. The reversal of 61111511550555 is 55505511511116.

It is a happy number.

It is not a de Polignac number, because 61111511550555 - 2³³ = 61102921615963 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2314203162 + ... + 2314229568.

It is an arithmetic number, because the mean of its divisors is an integer number (3056214582672).

Almost surely, 2^{61111511550555} is an apocalyptic number.

61111511550555 is a deficient number, since it is larger than the sum of its proper divisors (36687355094949).

61111511550555 is a wasteful number, since it uses less digits than its factorization.

61111511550555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52835.

The product of its (nonzero) digits is 93750, while the sum is 42.

The spelling of 61111511550555 in words is "sixty-one trillion, one hundred eleven billion, five hundred eleven million, five hundred fifty thousand, five hundred fifty-five".