61156699979 has 8 divisors (see below), whose sum is σ = 61221047472. Its totient is φ = 61092390240.

The previous prime is 61156699937. The next prime is 61156699987. The reversal of 61156699979 is 97999665116.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61156699979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61156690979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4121177 + ... + 4135989.

It is an arithmetic number, because the mean of its divisors is an integer number (7652630934).

Almost surely, 2^61156699979 is an apocalyptic number.

61156699979 is a deficient number, since it is larger than the sum of its proper divisors (64347493).

61156699979 is a wasteful number, since it uses less digits than its factorization.

61156699979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18877.

The product of its digits is 49601160, while the sum is 68.

The spelling of 61156699979 in words is "sixty-one billion, one hundred fifty-six million, six hundred ninety-nine thousand, nine hundred seventy-nine".