61987851172 has 24 divisors (see below), whose sum is σ = 121902532416. Its totient is φ = 27365873568.

The previous prime is 61987851137. The next prime is 61987851199. The reversal of 61987851172 is 27115878916.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25913458 + ... + 25915849.

It is an arithmetic number, because the mean of its divisors is an integer number (5079272184).

Almost surely, 2^61987851172 is an apocalyptic number.

It is an amenable number.

61987851172 is a deficient number, since it is larger than the sum of its proper divisors (59914681244).

61987851172 is a wasteful number, since it uses less digits than its factorization.

61987851172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51829347 (or 51829345 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 55.

The spelling of 61987851172 in words is "sixty-one billion, nine hundred eighty-seven million, eight hundred fifty-one thousand, one hundred seventy-two".