1661715675 has 24 divisors (see below), whose sum is σ = 3052634480. Its totient is φ = 886248000.

The previous prime is 1661715611. The next prime is 1661715697. The reversal of 1661715675 is 5765171661.

1661715675 is a `hidden beast` number, since 16 + 6 + 1 + 71 + 567 + 5 = 666.

It is not a de Polignac number, because 1661715675 - 2⁶ = 1661715611 is a prime.

It is a super-2 number, since 2×1661715675² = 5522597969081411250, which contains 22 as substring.

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 1661715675.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1230226 + ... + 1231575.

Almost surely, 2^1661715675 is an apocalyptic number.

1661715675 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1661715675 is a deficient number, since it is larger than the sum of its proper divisors (1390918805).

1661715675 is a wasteful number, since it uses less digits than its factorization.

1661715675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461820 (or 2461809 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 1661715675 is about 40764.1469308509. The cubic root of 1661715675 is about 1184.4559271310.

The spelling of 1661715675 in words is "one billion, six hundred sixty-one million, seven hundred fifteen thousand, six hundred seventy-five".