661924507 has 16 divisors (see below), whose sum is σ = 700525440. Its totient is φ = 624540672.

The previous prime is 661924477. The next prime is 661924511. The reversal of 661924507 is 705429166.

It is a cyclic number.

It is not a de Polignac number, because 661924507 - 2⁷ = 661924379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661924507.

It is not an unprimeable number, because it can be changed into a prime (661924537) 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, 237838 + ... + 240604.

It is an arithmetic number, because the mean of its divisors is an integer number (43782840).

Almost surely, 2^661924507 is an apocalyptic number.

661924507 is a deficient number, since it is larger than the sum of its proper divisors (38600933).

661924507 is a wasteful number, since it uses less digits than its factorization.

661924507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 661924507 is about 25727.8935593258. The cubic root of 661924507 is about 871.5042049262.

The spelling of 661924507 in words is "six hundred sixty-one million, nine hundred twenty-four thousand, five hundred seven".