215971399074 has 16 divisors (see below), whose sum is σ = 440092662912. Its totient is φ = 70632155568.

The previous prime is 215971399069. The next prime is 215971399087. The reversal of 215971399074 is 470993179512.

It is a happy number.

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, 339577354 + ... + 339577989.

It is an arithmetic number, because the mean of its divisors is an integer number (27505791432).

Almost surely, 2^215971399074 is an apocalyptic number.

215971399074 is an abundant number, since it is smaller than the sum of its proper divisors (224121263838).

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

215971399074 is a wasteful number, since it uses less digits than its factorization.

215971399074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679155401.

The product of its (nonzero) digits is 4286520, while the sum is 57.

The spelling of 215971399074 in words is "two hundred fifteen billion, nine hundred seventy-one million, three hundred ninety-nine thousand, seventy-four".