661127444 has 12 divisors (see below), whose sum is σ = 1157412564. Its totient is φ = 330438144.

The previous prime is 661127437. The next prime is 661127461. The reversal of 661127444 is 444721166.

It can be written as a sum of positive squares in 2 ways, for example, as 580810000 + 80317444 = 24100^2 + 8962^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19007 + ... + 41030.

It is an arithmetic number, because the mean of its divisors is an integer number (96451047).

Almost surely, 2^661127444 is an apocalyptic number.

It is an amenable number.

661127444 is a deficient number, since it is larger than the sum of its proper divisors (496285120).

661127444 is a wasteful number, since it uses less digits than its factorization.

661127444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62794 (or 62792 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 661127444 is about 25712.3986434560. The cubic root of 661127444 is about 871.1542542615.

The spelling of 661127444 in words is "six hundred sixty-one million, one hundred twenty-seven thousand, four hundred forty-four".