61115111005 has 16 divisors (see below), whose sum is σ = 78997811760. Its totient is φ = 45120711168.

The previous prime is 61115110963. The next prime is 61115111051. The reversal of 61115111005 is 50011151116.

It can be written as a sum of positive squares in 8 ways, for example, as 26582693764 + 34532417241 = 163042^2 + 185829^2 .

It is not a de Polignac number, because 61115111005 - 2⁹ = 61115110493 is a prime.

It is a super-2 number, since 2×61115111005² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179959 + ... + 393211.

It is an arithmetic number, because the mean of its divisors is an integer number (4937363235).

Almost surely, 2^61115111005 is an apocalyptic number.

61115111005 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61115111005 is a deficient number, since it is larger than the sum of its proper divisors (17882700755).

61115111005 is a wasteful number, since it uses less digits than its factorization.

61115111005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217680.

The product of its (nonzero) digits is 150, while the sum is 22.

The spelling of 61115111005 in words is "sixty-one billion, one hundred fifteen million, one hundred eleven thousand, five".