1611610641 has 16 divisors (see below), whose sum is σ = 2411214720. Its totient is φ = 1063767600.

The previous prime is 1611610639. The next prime is 1611610643. The reversal of 1611610641 is 1460161161.

It is a happy number.

1611610641 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 6 + 10 + 641 = 666.

It is an interprime number because it is at equal distance from previous prime (1611610639) and next prime (1611610643).

It is not a de Polignac number, because 1611610641 - 2¹ = 1611610639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1611610643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292765 + ... + 298218.

It is an arithmetic number, because the mean of its divisors is an integer number (150700920).

Almost surely, 2^1611610641 is an apocalyptic number.

It is an amenable number.

1611610641 is a deficient number, since it is larger than the sum of its proper divisors (799604079).

1611610641 is a wasteful number, since it uses less digits than its factorization.

1611610641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591093 (or 591087 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1611610641 is about 40144.8706686172. The cubic root of 1611610641 is about 1172.4294227259.

The spelling of 1611610641 in words is "one billion, six hundred eleven million, six hundred ten thousand, six hundred forty-one".