623157661 has 16 divisors (see below), whose sum is σ = 758612736. Its totient is φ = 499689216.

The previous prime is 623157659. The next prime is 623157673. The reversal of 623157661 is 166751326.

It is a cyclic number.

It is not a de Polignac number, because 623157661 - 2¹ = 623157659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 623157661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623157361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4195 + ... + 35551.

It is an arithmetic number, because the mean of its divisors is an integer number (47413296).

Almost surely, 2^623157661 is an apocalyptic number.

It is an amenable number.

623157661 is a deficient number, since it is larger than the sum of its proper divisors (135455075).

623157661 is a wasteful number, since it uses less digits than its factorization.

623157661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31548.

The product of its digits is 45360, while the sum is 37.

The square root of 623157661 is about 24963.1260262011. The cubic root of 623157661 is about 854.1470517561.

The spelling of 623157661 in words is "six hundred twenty-three million, one hundred fifty-seven thousand, six hundred sixty-one".