78157491206 has 4 divisors (see below), whose sum is σ = 117236236812. Its totient is φ = 39078745602.

The previous prime is 78157491179. The next prime is 78157491227. The reversal of 78157491206 is 60219475187.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78157491206² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19539372800 + ... + 19539372803.

It is an arithmetic number, because the mean of its divisors is an integer number (29309059203).

Almost surely, 2^78157491206 is an apocalyptic number.

78157491206 is a deficient number, since it is larger than the sum of its proper divisors (39078745606).

78157491206 is a wasteful number, since it uses less digits than its factorization.

78157491206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39078745605.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 78157491206 in words is "seventy-eight billion, one hundred fifty-seven million, four hundred ninety-one thousand, two hundred six".