213787666515 has 8 divisors (see below), whose sum is σ = 342060266448. Its totient is φ = 114020088800.

The previous prime is 213787666501. The next prime is 213787666523. The reversal of 213787666515 is 515666787312.

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

It is not a de Polignac number, because 213787666515 - 2⁶ = 213787666451 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7126255536 + ... + 7126255565.

It is an arithmetic number, because the mean of its divisors is an integer number (42757533306).

Almost surely, 2^213787666515 is an apocalyptic number.

213787666515 is a deficient number, since it is larger than the sum of its proper divisors (128272599933).

213787666515 is a wasteful number, since it uses less digits than its factorization.

213787666515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14252511109.

The product of its digits is 12700800, while the sum is 57.

The spelling of 213787666515 in words is "two hundred thirteen billion, seven hundred eighty-seven million, six hundred sixty-six thousand, five hundred fifteen".