78302124137 has 4 divisors (see below), whose sum is σ = 78325805136. Its totient is φ = 78278443140.

The previous prime is 78302124107. The next prime is 78302124139. The reversal of 78302124137 is 73142120387.

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 78302124137 - 2¹² = 78302120041 is a prime.

It is a super-2 number, since 2×78302124137² (a number of 23 digits) contains 22 as substring.

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 78302124137.

It is not an unprimeable number, because it can be changed into a prime (78302124139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11835539 + ... + 11842152.

It is an arithmetic number, because the mean of its divisors is an integer number (19581451284).

Almost surely, 2^78302124137 is an apocalyptic number.

It is an amenable number.

78302124137 is a deficient number, since it is larger than the sum of its proper divisors (23680999).

78302124137 is a wasteful number, since it uses less digits than its factorization.

78302124137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23680998.

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 78302124137 in words is "seventy-eight billion, three hundred two million, one hundred twenty-four thousand, one hundred thirty-seven".