78749651537 has 8 divisors (see below), whose sum is σ = 78851037600. Its totient is φ = 78648305824.

The previous prime is 78749651471. The next prime is 78749651609. The reversal of 78749651537 is 73515694787.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78749651537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78749651537.

It is not an unprimeable number, because it can be changed into a prime (78749651237) 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, 6214514 + ... + 6227172.

It is an arithmetic number, because the mean of its divisors is an integer number (9856379700).

Almost surely, 2^78749651537 is an apocalyptic number.

It is an amenable number.

78749651537 is a deficient number, since it is larger than the sum of its proper divisors (101386063).

78749651537 is a wasteful number, since it uses less digits than its factorization.

78749651537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20175.

The product of its digits is 44452800, while the sum is 62.

The spelling of 78749651537 in words is "seventy-eight billion, seven hundred forty-nine million, six hundred fifty-one thousand, five hundred thirty-seven".