61115111018 has 16 divisors (see below), whose sum is σ = 98728488096. Its totient is φ = 28205809200.

The previous prime is 61115110963. The next prime is 61115111051. The reversal of 61115111018 is 81011151116.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 1171805 + ... + 1222847.

It is an arithmetic number, because the mean of its divisors is an integer number (6170530506).

Almost surely, 2^61115111018 is an apocalyptic number.

61115111018 is a deficient number, since it is larger than the sum of its proper divisors (37613377078).

61115111018 is a wasteful number, since it uses less digits than its factorization.

61115111018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97109.

The product of its (nonzero) digits is 240, while the sum is 26.

The spelling of 61115111018 in words is "sixty-one billion, one hundred fifteen million, one hundred eleven thousand, eighteen".