216201557 has 16 divisors (see below), whose sum is σ = 254778048. Its totient is φ = 180871680.

The previous prime is 216201553. The next prime is 216201593. The reversal of 216201557 is 755102612.

It is not a de Polignac number, because 216201557 - 2² = 216201553 is a prime.

It is a super-2 number, since 2×216201557² = 93486226498448498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216201553) 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, 48338 + ... + 52620.

It is an arithmetic number, because the mean of its divisors is an integer number (15923628).

Almost surely, 2^216201557 is an apocalyptic number.

It is an amenable number.

216201557 is a deficient number, since it is larger than the sum of its proper divisors (38576491).

216201557 is a wasteful number, since it uses less digits than its factorization.

216201557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4660.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 216201557 is about 14703.7939661844. The cubic root of 216201557 is about 600.1865688326.

The spelling of 216201557 in words is "two hundred sixteen million, two hundred one thousand, five hundred fifty-seven".