78749157013 has 4 divisors (see below), whose sum is σ = 80424671040. Its totient is φ = 77073642988.

The previous prime is 78749156989. The next prime is 78749157029. The reversal of 78749157013 is 31075194787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78749157013 - 2²¹ = 78747059861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78749157073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837756943 + ... + 837757036.

It is an arithmetic number, because the mean of its divisors is an integer number (20106167760).

Almost surely, 2^78749157013 is an apocalyptic number.

It is an amenable number.

78749157013 is a deficient number, since it is larger than the sum of its proper divisors (1675514027).

78749157013 is a wasteful number, since it uses less digits than its factorization.

78749157013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675514026.

The product of its (nonzero) digits is 1481760, while the sum is 52.

The spelling of 78749157013 in words is "seventy-eight billion, seven hundred forty-nine million, one hundred fifty-seven thousand, thirteen".