20151644463 has 12 divisors (see below), whose sum is σ = 29213017288. Its totient is φ = 13385928240.

The previous prime is 20151644459. The next prime is 20151644477. The reversal of 20151644463 is 36444615102.

20151644463 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 1 + 644 + 4 + 6 + 3 = 666.

It is not a de Polignac number, because 20151644463 - 2² = 20151644459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20151644423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4039153 + ... + 4044138.

Almost surely, 2^20151644463 is an apocalyptic number.

20151644463 is a deficient number, since it is larger than the sum of its proper divisors (9061372825).

20151644463 is a wasteful number, since it uses less digits than its factorization.

20151644463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8083574 (or 8083571 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 20151644463 in words is "twenty billion, one hundred fifty-one million, six hundred forty-four thousand, four hundred sixty-three".