61279668993 has 16 divisors (see below), whose sum is σ = 83863584000. Its totient is φ = 39778350720.

The previous prime is 61279668979. The next prime is 61279668997. The reversal of 61279668993 is 39986697216.

It is a happy number.

It is not a de Polignac number, because 61279668993 - 2⁴ = 61279668977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61279668997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426793 + ... + 552006.

It is an arithmetic number, because the mean of its divisors is an integer number (5241474000).

Almost surely, 2^61279668993 is an apocalyptic number.

It is an amenable number.

61279668993 is a deficient number, since it is larger than the sum of its proper divisors (22583915007).

61279668993 is a wasteful number, since it uses less digits than its factorization.

61279668993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979352.

The product of its digits is 52907904, while the sum is 66.

The spelling of 61279668993 in words is "sixty-one billion, two hundred seventy-nine million, six hundred sixty-eight thousand, nine hundred ninety-three".