61727178879 has 12 divisors (see below), whose sum is σ = 89164259496. Its totient is φ = 41150170032.

The previous prime is 61727178871. The next prime is 61727178881. The reversal of 61727178879 is 97887172716.

61727178879 is a `hidden beast` number, since 617 + 2 + 7 + 1 + 7 + 8 + 8 + 7 + 9 = 666.

It is not a de Polignac number, because 61727178879 - 2³ = 61727178871 is a prime.

It is a super-2 number, since 2×61727178879² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61727178871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 266632 + ... + 441074.

It is an arithmetic number, because the mean of its divisors is an integer number (7430354958).

Almost surely, 2^61727178879 is an apocalyptic number.

61727178879 is a deficient number, since it is larger than the sum of its proper divisors (27437080617).

61727178879 is a wasteful number, since it uses less digits than its factorization.

61727178879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213766 (or 213763 counting only the distinct ones).

The product of its digits is 16595712, while the sum is 63.

The spelling of 61727178879 in words is "sixty-one billion, seven hundred twenty-seven million, one hundred seventy-eight thousand, eight hundred seventy-nine".