661614431 has 8 divisors (see below), whose sum is σ = 683288064. Its totient is φ = 639961560.

The previous prime is 661614419. The next prime is 661614433. The reversal of 661614431 is 134416166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661614431 - 2²⁶ = 594505567 is a prime.

It is a super-2 number, since 2×661614431² = 875467310614907522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661614433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84380 + ... + 91886.

It is an arithmetic number, because the mean of its divisors is an integer number (85411008).

Almost surely, 2^661614431 is an apocalyptic number.

661614431 is a deficient number, since it is larger than the sum of its proper divisors (21673633).

661614431 is a wasteful number, since it uses less digits than its factorization.

661614431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10381.

The product of its digits is 10368, while the sum is 32.

The square root of 661614431 is about 25721.8667868411. The cubic root of 661614431 is about 871.3680994023.

The spelling of 661614431 in words is "six hundred sixty-one million, six hundred fourteen thousand, four hundred thirty-one".