1561622652 has 60 divisors (see below), whose sum is σ = 4322545920. Its totient is φ = 489919104.

The previous prime is 1561622633. The next prime is 1561622663. The reversal of 1561622652 is 2562261651.

1561622652 is a `hidden beast` number, since 15 + 616 + 2 + 26 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 136252 + ... + 147267.

It is an arithmetic number, because the mean of its divisors is an integer number (72042432).

Almost surely, 2^1561622652 is an apocalyptic number.

1561622652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561622652 is an abundant number, since it is smaller than the sum of its proper divisors (2760923268).

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

1561622652 is a wasteful number, since it uses less digits than its factorization.

1561622652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283552 (or 283541 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1561622652 is about 39517.3715219016. The cubic root of 1561622652 is about 1160.1799790102.

The spelling of 1561622652 in words is "one billion, five hundred sixty-one million, six hundred twenty-two thousand, six hundred fifty-two".