78157399702 has 16 divisors (see below), whose sum is σ = 121171756032. Its totient is φ = 37770019560.

The previous prime is 78157399693. The next prime is 78157399709. The reversal of 78157399702 is 20799375187.

It is a super-2 number, since 2×78157399702² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78157399709) 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, 752098 + ... + 849685.

It is an arithmetic number, because the mean of its divisors is an integer number (7573234752).

Almost surely, 2^78157399702 is an apocalyptic number.

78157399702 is a deficient number, since it is larger than the sum of its proper divisors (43014356330).

78157399702 is a wasteful number, since it uses less digits than its factorization.

78157399702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602603.

The product of its (nonzero) digits is 6667920, while the sum is 58.

The spelling of 78157399702 in words is "seventy-eight billion, one hundred fifty-seven million, three hundred ninety-nine thousand, seven hundred two".