1611621460665 has 48 divisors (see below), whose sum is σ = 2815733097216. Its totient is φ = 852700867200.

The previous prime is 1611621460649. The next prime is 1611621460699. The reversal of 1611621460665 is 5660641261161.

1611621460665 is a `hidden beast` number, since 1 + 6 + 1 + 16 + 21 + 4 + 606 + 6 + 5 = 666.

It is not a de Polignac number, because 1611621460665 - 2⁴ = 1611621460649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1611621460665.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4277260 + ... + 4638770.

It is an arithmetic number, because the mean of its divisors is an integer number (58661106192).

Almost surely, 2^{1611621460665} is an apocalyptic number.

1611621460665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1611621460665 is a deficient number, since it is larger than the sum of its proper divisors (1204111636551).

1611621460665 is a wasteful number, since it uses less digits than its factorization.

1611621460665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362310 (or 362307 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 1611621460665 in words is "one trillion, six hundred eleven billion, six hundred twenty-one million, four hundred sixty thousand, six hundred sixty-five".