1660642401 has 16 divisors (see below), whose sum is σ = 2416310208. Its totient is φ = 1006104000.

The previous prime is 1660642391. The next prime is 1660642409. The reversal of 1660642401 is 1042460661.

It is not a de Polignac number, because 1660642401 - 2⁷ = 1660642273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1660642409) 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, 115335 + ... + 128931.

It is an arithmetic number, because the mean of its divisors is an integer number (151019388).

Almost surely, 2^1660642401 is an apocalyptic number.

1660642401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1660642401 is a deficient number, since it is larger than the sum of its proper divisors (755667807).

1660642401 is a wasteful number, since it uses less digits than its factorization.

1660642401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17312.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1660642401 is about 40750.9803685752. The cubic root of 1660642401 is about 1184.2008655381.

The spelling of 1660642401 in words is "one billion, six hundred sixty million, six hundred forty-two thousand, four hundred one".