15990203451 has 32 divisors (see below), whose sum is σ = 23907598848. Its totient is φ = 9453565440.

The previous prime is 15990203429. The next prime is 15990203461. The reversal of 15990203451 is 15430209951.

It is not a de Polignac number, because 15990203451 - 2⁶ = 15990203387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15990203461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23140 + ... + 180321.

It is an arithmetic number, because the mean of its divisors is an integer number (747112464).

Almost surely, 2^15990203451 is an apocalyptic number.

15990203451 is a deficient number, since it is larger than the sum of its proper divisors (7917395397).

15990203451 is a wasteful number, since it uses less digits than its factorization.

15990203451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203571.

The product of its (nonzero) digits is 48600, while the sum is 39.

The spelling of 15990203451 in words is "fifteen billion, nine hundred ninety million, two hundred three thousand, four hundred fifty-one".