78749157009 has 8 divisors (see below), whose sum is σ = 105263358400. Its totient is φ = 52367196816.

The previous prime is 78749156989. The next prime is 78749157029. The reversal of 78749157009 is 90075194787.

It is an interprime number because it is at equal distance from previous prime (78749156989) and next prime (78749157029).

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

It is not a de Polignac number, because 78749157009 - 2⁵ = 78749156977 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 78749157009.

It is not an unprimeable number, because it can be changed into a prime (78749157029) 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, 33058909 + ... + 33061290.

It is an arithmetic number, because the mean of its divisors is an integer number (13157919800).

Almost surely, 2^78749157009 is an apocalyptic number.

It is an amenable number.

78749157009 is a deficient number, since it is larger than the sum of its proper divisors (26514201391).

78749157009 is a wasteful number, since it uses less digits than its factorization.

78749157009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66120599.

The product of its (nonzero) digits is 4445280, while the sum is 57.

The spelling of 78749157009 in words is "seventy-eight billion, seven hundred forty-nine million, one hundred fifty-seven thousand, nine".