64312021692 has 18 divisors (see below), whose sum is σ = 162566499368. Its totient is φ = 21437340552.

The previous prime is 64312021691. The next prime is 64312021703. The reversal of 64312021692 is 29612021346.

It is a happy number.

64312021692 is a `hidden beast` number, since 6 + 431 + 2 + 0 + 216 + 9 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×64312021692² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1786445047 = 64312021692 / (6 + 4 + 3 + 1 + 2 + 0 + 2 + 1 + 6 + 9 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64312021691) 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, 893222488 + ... + 893222559.

Almost surely, 2^64312021692 is an apocalyptic number.

It is an amenable number.

64312021692 is an abundant number, since it is smaller than the sum of its proper divisors (98254477676).

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

64312021692 is a wasteful number, since it uses less digits than its factorization.

64312021692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786445057 (or 1786445052 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 64312021692 in words is "sixty-four billion, three hundred twelve million, twenty-one thousand, six hundred ninety-two".