661269790 has 32 divisors (see below), whose sum is σ = 1217752704. Its totient is φ = 258424320.

The previous prime is 661269761. The next prime is 661269793. The reversal of 661269790 is 97962166.

It is a self number, because there is not a number n which added to its sum of digits gives 661269790.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661269793) 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, 413272 + ... + 414868.

It is an arithmetic number, because the mean of its divisors is an integer number (38054772).

Almost surely, 2^661269790 is an apocalyptic number.

661269790 is a deficient number, since it is larger than the sum of its proper divisors (556482914).

661269790 is a wasteful number, since it uses less digits than its factorization.

661269790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 661269790 is about 25715.1665365014. The cubic root of 661269790 is about 871.2167719228.

The spelling of 661269790 in words is "six hundred sixty-one million, two hundred sixty-nine thousand, seven hundred ninety".