1611655920 has 160 divisors (see below), whose sum is σ = 6344355840. Its totient is φ = 368375040.

The previous prime is 1611655907. The next prime is 1611655937. The reversal of 1611655920 is 295561161.

1611655920 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 65 + 592 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38176 + ... + 68415.

It is an arithmetic number, because the mean of its divisors is an integer number (39652224).

Almost surely, 2^1611655920 is an apocalyptic number.

1611655920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1611655920 is an abundant number, since it is smaller than the sum of its proper divisors (4732699920).

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

1611655920 is a wasteful number, since it uses less digits than its factorization.

1611655920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106620 (or 106608 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 1611655920 is about 40145.4346096788. The cubic root of 1611655920 is about 1172.4404026184.

The spelling of 1611655920 in words is "one billion, six hundred eleven million, six hundred fifty-five thousand, nine hundred twenty".