157215666 has 16 divisors (see below), whose sum is σ = 319586688. Its totient is φ = 51546000.

The previous prime is 157215661. The next prime is 157215673. The reversal of 157215666 is 666512751.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157215661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214410 + ... + 215141.

It is an arithmetic number, because the mean of its divisors is an integer number (19974168).

Almost surely, 2^157215666 is an apocalyptic number.

157215666 is an abundant number, since it is smaller than the sum of its proper divisors (162371022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

157215666 is a wasteful number, since it uses less digits than its factorization.

157215666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429617.

The product of its digits is 75600, while the sum is 39.

The square root of 157215666 is about 12538.5671430192. The cubic root of 157215666 is about 539.7159754660.

The spelling of 157215666 in words is "one hundred fifty-seven million, two hundred fifteen thousand, six hundred sixty-six".