1561807485 has 48 divisors (see below), whose sum is σ = 3133079040. Its totient is φ = 704920320.

The previous prime is 1561807469. The next prime is 1561807517. The reversal of 1561807485 is 5847081651.

1561807485 is a `hidden beast` number, since 1 + 561 + 8 + 0 + 7 + 4 + 85 = 666.

It is not a de Polignac number, because 1561807485 - 2⁴ = 1561807469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1561807485.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6496 + ... + 56265.

It is an arithmetic number, because the mean of its divisors is an integer number (65272480).

Almost surely, 2^1561807485 is an apocalyptic number.

1561807485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561807485 is an abundant number, since it is smaller than the sum of its proper divisors (1571271555).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561807485 is a wasteful number, since it uses less digits than its factorization.

1561807485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62858 (or 62855 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The square root of 1561807485 is about 39519.7100824386. The cubic root of 1561807485 is about 1160.2257500092.

The spelling of 1561807485 in words is "one billion, five hundred sixty-one million, eight hundred seven thousand, four hundred eighty-five".