214807681557 has 48 divisors (see below), whose sum is σ = 370612919040. Its totient is φ = 117292686336.

The previous prime is 214807681553. The next prime is 214807681603. The reversal of 214807681557 is 755186708412.

214807681557 is a `hidden beast` number, since 2 + 1 + 4 + 8 + 0 + 7 + 6 + 81 + 557 = 666.

It is not a de Polignac number, because 214807681557 - 2² = 214807681553 is a prime.

It is a super-2 number, since 2×214807681557² (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 (214807681553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 428833 + ... + 783270.

It is an arithmetic number, because the mean of its divisors is an integer number (7721102480).

Almost surely, 2^214807681557 is an apocalyptic number.

It is an amenable number.

214807681557 is a deficient number, since it is larger than the sum of its proper divisors (155805237483).

214807681557 is a wasteful number, since it uses less digits than its factorization.

214807681557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212242 (or 1212239 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 54.

The spelling of 214807681557 in words is "two hundred fourteen billion, eight hundred seven million, six hundred eighty-one thousand, five hundred fifty-seven".