1561152465 has 12 divisors (see below), whose sum is σ = 2705997684. Its totient is φ = 832614624.

The previous prime is 1561152457. The next prime is 1561152469. The reversal of 1561152465 is 5642511651.

1561152465 is a `hidden beast` number, since 1 + 561 + 1 + 52 + 46 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 195776064 + 1365376401 = 13992^2 + 36951^2 .

It is not a de Polignac number, because 1561152465 - 2³ = 1561152457 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1561152469) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17346094 + ... + 17346183.

It is an arithmetic number, because the mean of its divisors is an integer number (225499807).

Almost surely, 2^1561152465 is an apocalyptic number.

1561152465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561152465 is a deficient number, since it is larger than the sum of its proper divisors (1144845219).

1561152465 is a wasteful number, since it uses less digits than its factorization.

1561152465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34692288 (or 34692285 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 1561152465 is about 39511.4219561888. The cubic root of 1561152465 is about 1160.0635282786.

The spelling of 1561152465 in words is "one billion, five hundred sixty-one million, one hundred fifty-two thousand, four hundred sixty-five".