1661631460 has 48 divisors (see below), whose sum is σ = 3596769792. Its totient is φ = 644515200.

The previous prime is 1661631457. The next prime is 1661631469. The reversal of 1661631460 is 641361661.

It is a super-2 number, since 2×1661631460² = 5522038217723463200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1661631469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77029 + ... + 96211.

It is an arithmetic number, because the mean of its divisors is an integer number (74932704).

Almost surely, 2^1661631460 is an apocalyptic number.

1661631460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661631460 is an abundant number, since it is smaller than the sum of its proper divisors (1935138332).

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

1661631460 is a wasteful number, since it uses less digits than its factorization.

1661631460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19324 (or 19322 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1661631460 is about 40763.1139634842. The cubic root of 1661631460 is about 1184.4359175625.

The spelling of 1661631460 in words is "one billion, six hundred sixty-one million, six hundred thirty-one thousand, four hundred sixty".