61147699972 has 24 divisors (see below), whose sum is σ = 108756408600. Its totient is φ = 30078297600.

The previous prime is 61147699969. The next prime is 61147699979. The reversal of 61147699972 is 27999674116.

It can be written as a sum of positive squares in 4 ways, for example, as 20350163716 + 40797536256 = 142654^2 + 201984^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61147699972.

It is not an unprimeable number, because it can be changed into a prime (61147699979) 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, 418597 + ... + 545452.

It is an arithmetic number, because the mean of its divisors is an integer number (4531517025).

Almost surely, 2^61147699972 is an apocalyptic number.

It is an amenable number.

61147699972 is a deficient number, since it is larger than the sum of its proper divisors (47608708628).

61147699972 is a wasteful number, since it uses less digits than its factorization.

61147699972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964311 (or 964309 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 61.

The spelling of 61147699972 in words is "sixty-one billion, one hundred forty-seven million, six hundred ninety-nine thousand, nine hundred seventy-two".