215690649412 has 18 divisors (see below), whose sum is σ = 439084536702. Its totient is φ = 92438849664.

The previous prime is 215690649367. The next prime is 215690649413. The reversal of 215690649412 is 214946096512.

It is a happy number.

215690649412 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 165017938176 + 50672711236 = 406224^2 + 225106^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (215690649413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 550231053 + ... + 550231444.

Almost surely, 2^215690649412 is an apocalyptic number.

It is an amenable number.

215690649412 is an abundant number, since it is smaller than the sum of its proper divisors (223393887290).

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

215690649412 is a wasteful number, since it uses less digits than its factorization.

215690649412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100462515 (or 1100462506 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 215690649412 in words is "two hundred fifteen billion, six hundred ninety million, six hundred forty-nine thousand, four hundred twelve".