156801557 has 16 divisors (see below), whose sum is σ = 188998272. Its totient is φ = 128325120.

The previous prime is 156801517. The next prime is 156801577. The reversal of 156801557 is 755108651.

It is a happy number.

It is not a de Polignac number, because 156801557 - 2²² = 152607253 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 156801557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156801517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13928 + ... + 22529.

It is an arithmetic number, because the mean of its divisors is an integer number (11812392).

Almost surely, 2^156801557 is an apocalyptic number.

156801557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

156801557 is a deficient number, since it is larger than the sum of its proper divisors (32196715).

156801557 is a wasteful number, since it uses less digits than its factorization.

156801557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36508.

The product of its (nonzero) digits is 42000, while the sum is 38.

The square root of 156801557 is about 12522.0428445202. The cubic root of 156801557 is about 539.2416848058.

The spelling of 156801557 in words is "one hundred fifty-six million, eight hundred one thousand, five hundred fifty-seven".