61115515105 has 8 divisors (see below), whose sum is σ = 73407746664. Its totient is φ = 48846326400.

The previous prime is 61115515093. The next prime is 61115515127. The reversal of 61115515105 is 50151551116.

It can be written as a sum of positive squares in 4 ways, for example, as 23206256896 + 37909258209 = 152336^2 + 194703^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-61115515105 is a prime.

It is a super-2 number, since 2×61115515105² (a number of 22 digits) contains 22 as substring.

It is a Duffinian 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, 5754876 + ... + 5765485.

It is an arithmetic number, because the mean of its divisors is an integer number (9175968333).

Almost surely, 2^61115515105 is an apocalyptic number.

It is an amenable number.

61115515105 is a deficient number, since it is larger than the sum of its proper divisors (12292231559).

61115515105 is a wasteful number, since it uses less digits than its factorization.

61115515105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11521427.

The product of its (nonzero) digits is 3750, while the sum is 31.

The spelling of 61115515105 in words is "sixty-one billion, one hundred fifteen million, five hundred fifteen thousand, one hundred five".