1661235412 has 12 divisors (see below), whose sum is σ = 2907452800. Its totient is φ = 830534616.

The previous prime is 1661235403. The next prime is 1661235431. The reversal of 1661235412 is 2145321661.

It is a happy number.

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, 54589 + ... + 79387.

Almost surely, 2^1661235412 is an apocalyptic number.

It is an amenable number.

1661235412 is a deficient number, since it is larger than the sum of its proper divisors (1246217388).

1661235412 is a wasteful number, since it uses less digits than its factorization.

1661235412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41550 (or 41548 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 1661235412 is about 40758.2557526693. The cubic root of 1661235412 is about 1184.3418070930.

The spelling of 1661235412 in words is "one billion, six hundred sixty-one million, two hundred thirty-five thousand, four hundred twelve".