15978959001 has 12 divisors (see below), whose sum is σ = 23121289620. Its totient is φ = 10633914240.

The previous prime is 15978958973. The next prime is 15978959011. The reversal of 15978959001 is 10095987951.

15978959001 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 2 ways, for example, as 2216149776 + 13762809225 = 47076^2 + 117315^2 .

It is not a de Polignac number, because 15978959001 - 2⁷ = 15978958873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15978959011) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 1555020 + ... + 1565261.

It is an arithmetic number, because the mean of its divisors is an integer number (1926774135).

Almost surely, 2^15978959001 is an apocalyptic number.

It is an amenable number.

15978959001 is a deficient number, since it is larger than the sum of its proper divisors (7142330619).

15978959001 is a wasteful number, since it uses less digits than its factorization.

15978959001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3120856 (or 3120853 counting only the distinct ones).

The product of its (nonzero) digits is 1020600, while the sum is 54.

The spelling of 15978959001 in words is "fifteen billion, nine hundred seventy-eight million, nine hundred fifty-nine thousand, one".