15987020797 has 8 divisors (see below), whose sum is σ = 17686026432. Its totient is φ = 14328955200.

The previous prime is 15987020767. The next prime is 15987020809. The reversal of 15987020797 is 79702078951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15987020797 - 2³¹ = 13839537149 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 (15987020767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10234188 + ... + 10235749.

It is an arithmetic number, because the mean of its divisors is an integer number (2210753304).

Almost surely, 2^15987020797 is an apocalyptic number.

It is an amenable number.

15987020797 is a deficient number, since it is larger than the sum of its proper divisors (1699005635).

15987020797 is a wasteful number, since it uses less digits than its factorization.

15987020797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20470019.

The product of its (nonzero) digits is 2222640, while the sum is 55.

The spelling of 15987020797 in words is "fifteen billion, nine hundred eighty-seven million, twenty thousand, seven hundred ninety-seven".