78148637002172 has 24 divisors (see below), whose sum is σ = 149557627193520. Its totient is φ = 35435256600960.

The previous prime is 78148637002159. The next prime is 78148637002217. The reversal of 78148637002172 is 27120073684187.

It is a super-2 number, since 2×78148637002172² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2171259983 + ... + 2171295974.

It is an arithmetic number, because the mean of its divisors is an integer number (6231567799730).

Almost surely, 2^{78148637002172} is an apocalyptic number.

It is an amenable number.

78148637002172 is a deficient number, since it is larger than the sum of its proper divisors (71408990191348).

78148637002172 is a wasteful number, since it uses less digits than its factorization.

78148637002172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4342556381 (or 4342556379 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 56.

The spelling of 78148637002172 in words is "seventy-eight trillion, one hundred forty-eight billion, six hundred thirty-seven million, two thousand, one hundred seventy-two".