1561902465 has 16 divisors (see below), whose sum is σ = 2501356608. Its totient is φ = 832243776.

The previous prime is 1561902451. The next prime is 1561902473. The reversal of 1561902465 is 5642091651.

It is not a de Polignac number, because 1561902465 - 2⁶ = 1561902401 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31239 + ... + 64028.

It is an arithmetic number, because the mean of its divisors is an integer number (156334788).

Almost surely, 2^1561902465 is an apocalyptic number.

1561902465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561902465 is a deficient number, since it is larger than the sum of its proper divisors (939454143).

1561902465 is a wasteful number, since it uses less digits than its factorization.

1561902465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96368.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 1561902465 is about 39520.9117430254. The cubic root of 1561902465 is about 1160.2492689147.

The spelling of 1561902465 in words is "one billion, five hundred sixty-one million, nine hundred two thousand, four hundred sixty-five".