661207023 has 16 divisors (see below), whose sum is σ = 981909600. Its totient is φ = 439750080.

The previous prime is 661207007. The next prime is 661207037. The reversal of 661207023 is 320702166.

It is a happy number.

It is not a de Polignac number, because 661207023 - 2⁴ = 661207007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661207223) 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, 17718 + ... + 40451.

It is an arithmetic number, because the mean of its divisors is an integer number (61369350).

Almost surely, 2^661207023 is an apocalyptic number.

661207023 is a deficient number, since it is larger than the sum of its proper divisors (320702577).

661207023 is a wasteful number, since it uses less digits than its factorization.

661207023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58599 (or 58593 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 661207023 is about 25713.9460798999. The cubic root of 661207023 is about 871.1892060718.

Adding to 661207023 its reverse (320702166), we get a palindrome (981909189).

The spelling of 661207023 in words is "six hundred sixty-one million, two hundred seven thousand, twenty-three".