1561922366 has 16 divisors (see below), whose sum is σ = 2418694224. Its totient is φ = 755910144.

The previous prime is 1561922359. The next prime is 1561922371. The reversal of 1561922366 is 6632291651.

It is a super-2 number, since 2×1561922366² = 4879202954822075912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40400 + ... + 68963.

It is an arithmetic number, because the mean of its divisors is an integer number (151168389).

Almost surely, 2^1561922366 is an apocalyptic number.

1561922366 is a deficient number, since it is larger than the sum of its proper divisors (856771858).

1561922366 is a wasteful number, since it uses less digits than its factorization.

1561922366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109595.

The product of its digits is 116640, while the sum is 41.

The square root of 1561922366 is about 39521.1635203216. The cubic root of 1561922366 is about 1160.2541966706.

The spelling of 1561922366 in words is "one billion, five hundred sixty-one million, nine hundred twenty-two thousand, three hundred sixty-six".