15981071464 has 8 divisors (see below), whose sum is σ = 29964509010. Its totient is φ = 7990535728.

The previous prime is 15981071453. The next prime is 15981071501. The reversal of 15981071464 is 46417018951.

15981071464 is digitally balanced in base 2, 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., 14842548900 + 1138522564 = 121830^2 + 33742^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 998816959 + ... + 998816974.

Almost surely, 2^15981071464 is an apocalyptic number.

It is an amenable number.

15981071464 is a deficient number, since it is larger than the sum of its proper divisors (13983437546).

15981071464 is a wasteful number, since it uses less digits than its factorization.

15981071464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997633939 (or 1997633935 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 15981071464 in words is "fifteen billion, nine hundred eighty-one million, seventy-one thousand, four hundred sixty-four".