1642566680 has 32 divisors (see below), whose sum is σ = 3740310000. Its totient is φ = 649109376.

The previous prime is 1642566677. The next prime is 1642566691. The reversal of 1642566680 is 866652461.

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, 244055 + ... + 250694.

Almost surely, 2^1642566680 is an apocalyptic number.

1642566680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1642566680 is an abundant number, since it is smaller than the sum of its proper divisors (2097743320).

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

1642566680 is a wasteful number, since it uses less digits than its factorization.

1642566680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494843 (or 494839 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The square root of 1642566680 is about 40528.5908958108. The cubic root of 1642566680 is about 1179.8885942894. Note that the first 3 decimals are identical.

The spelling of 1642566680 in words is "one billion, six hundred forty-two million, five hundred sixty-six thousand, six hundred eighty".