1661125366 has 16 divisors (see below), whose sum is σ = 2635644384. Its totient is φ = 783566784.

The previous prime is 1661125357. The next prime is 1661125409. The reversal of 1661125366 is 6635211661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243981 + ... + 250696.

It is an arithmetic number, because the mean of its divisors is an integer number (164727774).

Almost surely, 2^1661125366 is an apocalyptic number.

1661125366 is a deficient number, since it is larger than the sum of its proper divisors (974519018).

1661125366 is a wasteful number, since it uses less digits than its factorization.

1661125366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494775.

The product of its digits is 38880, while the sum is 37.

The square root of 1661125366 is about 40756.9057461432. The cubic root of 1661125366 is about 1184.3156548781.

The spelling of 1661125366 in words is "one billion, six hundred sixty-one million, one hundred twenty-five thousand, three hundred sixty-six".