61276638899 has 20 divisors (see below), whose sum is σ = 71519277480. Its totient is φ = 52497768960.

The previous prime is 61276638889. The next prime is 61276638923. The reversal of 61276638899 is 99883667216.

It is a de Polignac number, because none of the positive numbers 2^k-61276638899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61276638889) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6451544 + ... + 6461034.

It is an arithmetic number, because the mean of its divisors is an integer number (3575963874).

Almost surely, 2^61276638899 is an apocalyptic number.

61276638899 is a deficient number, since it is larger than the sum of its proper divisors (10242638581).

61276638899 is an frugal number, since it uses more digits than its factorization.

61276638899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12208 (or 12187 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 65.

The spelling of 61276638899 in words is "sixty-one billion, two hundred seventy-six million, six hundred thirty-eight thousand, eight hundred ninety-nine".