1661235356 has 12 divisors (see below), whose sum is σ = 3171449400. Its totient is φ = 755106960.

The previous prime is 1661235353. The next prime is 1661235403. The reversal of 1661235356 is 6535321661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661235353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18877631 + ... + 18877718.

It is an arithmetic number, because the mean of its divisors is an integer number (264287450).

Almost surely, 2^1661235356 is an apocalyptic number.

It is an amenable number.

1661235356 is a deficient number, since it is larger than the sum of its proper divisors (1510214044).

1661235356 is a wasteful number, since it uses less digits than its factorization.

1661235356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37755364 (or 37755362 counting only the distinct ones).

The product of its digits is 97200, while the sum is 38.

The square root of 1661235356 is about 40758.2550656919. The cubic root of 1661235356 is about 1184.3417937850.

The spelling of 1661235356 in words is "one billion, six hundred sixty-one million, two hundred thirty-five thousand, three hundred fifty-six".