61115111097 has 4 divisors (see below), whose sum is σ = 81486814800. Its totient is φ = 40743407396.

The previous prime is 61115111093. The next prime is 61115111117. The reversal of 61115111097 is 79011151116.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61115111097 - 2² = 61115111093 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61115111093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10185851847 + ... + 10185851852.

It is an arithmetic number, because the mean of its divisors is an integer number (20371703700).

Almost surely, 2^61115111097 is an apocalyptic number.

It is an amenable number.

61115111097 is a deficient number, since it is larger than the sum of its proper divisors (20371703703).

61115111097 is a wasteful number, since it uses less digits than its factorization.

61115111097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20371703702.

The product of its (nonzero) digits is 1890, while the sum is 33.

The spelling of 61115111097 in words is "sixty-one billion, one hundred fifteen million, one hundred eleven thousand, ninety-seven".