1661653308 has 72 divisors (see below), whose sum is σ = 4706335872. Its totient is φ = 454112736.

The previous prime is 1661653291. The next prime is 1661653309. The reversal of 1661653308 is 8033561661.

It is a super-2 number, since 2×1661653308² = 5522183431974685728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661653309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47910 + ... + 74957.

It is an arithmetic number, because the mean of its divisors is an integer number (65365776).

Almost surely, 2^1661653308 is an apocalyptic number.

It is an amenable number.

1661653308 is an abundant number, since it is smaller than the sum of its proper divisors (3044682564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661653308 is a wasteful number, since it uses less digits than its factorization.

1661653308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122911 (or 122902 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1661653308 is about 40763.3819499805. The cubic root of 1661653308 is about 1184.4411087342.

The spelling of 1661653308 in words is "one billion, six hundred sixty-one million, six hundred fifty-three thousand, three hundred eight".