156197939090 has 8 divisors (see below), whose sum is σ = 281156290380. Its totient is φ = 62479175632.

The previous prime is 156197939063. The next prime is 156197939141. The reversal of 156197939090 is 90939791651.

It can be written as a sum of positive squares in 2 ways, for example, as 154199938489 + 1998000601 = 392683^2 + 44699^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7809896945 + ... + 7809896964.

Almost surely, 2^156197939090 is an apocalyptic number.

156197939090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

156197939090 is a deficient number, since it is larger than the sum of its proper divisors (124958351290).

156197939090 is a wasteful number, since it uses less digits than its factorization.

156197939090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15619793916.

The product of its (nonzero) digits is 4133430, while the sum is 59.

The spelling of 156197939090 in words is "one hundred fifty-six billion, one hundred ninety-seven million, nine hundred thirty-nine thousand, ninety".