151215601666 has 4 divisors (see below), whose sum is σ = 226823402502. Its totient is φ = 75607800832.

The previous prime is 151215601631. The next prime is 151215601679. The reversal of 151215601666 is 666106512151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 115012548225 + 36203053441 = 339135^2 + 190271^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37803900415 + ... + 37803900418.

Almost surely, 2^151215601666 is an apocalyptic number.

151215601666 is a deficient number, since it is larger than the sum of its proper divisors (75607800836).

151215601666 is an equidigital number, since it uses as much as digits as its factorization.

151215601666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75607800835.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 151215601666 in words is "one hundred fifty-one billion, two hundred fifteen million, six hundred one thousand, six hundred sixty-six".