1580778081 has 27 divisors (see below), whose sum is σ = 2369983161. Its totient is φ = 1015285824.

The previous prime is 1580778061. The next prime is 1580778107. The reversal of 1580778081 is 1808770851.

The square root of 1580778081 is 39759.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 278723025 + 1302055056 = 16695^2 + 36084^2 .

It is not a de Polignac number, because 1580778081 - 2⁷ = 1580777953 is a prime.

It is a super-2 number, since 2×1580778081² = 4997718682740085122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1580778061) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3458805 + ... + 3459261.

Almost surely, 2^1580778081 is an apocalyptic number.

1580778081 is the 39759-th square number.

1580778081 is the 19880-th centered octagonal number.

It is an amenable number.

1580778081 is a deficient number, since it is larger than the sum of its proper divisors (789205080).

1580778081 is an frugal number, since it uses more digits than its factorization.

1580778081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 45.

The cubic root of 1580778081 is about 1164.9044432789.

The spelling of 1580778081 in words is "one billion, five hundred eighty million, seven hundred seventy-eight thousand, eighty-one".