1661227515275 has 12 divisors (see below), whose sum is σ = 2110164123144. Its totient is φ = 1296567816000.

The previous prime is 1661227515229. The next prime is 1661227515287. The reversal of 1661227515275 is 5725157221661.

It is a de Polignac number, because none of the positive numbers 2^k-1661227515275 is a prime.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 810353861 + ... + 810355910.

It is an arithmetic number, because the mean of its divisors is an integer number (175847010262).

Almost surely, 2^{1661227515275} is an apocalyptic number.

1661227515275 is a deficient number, since it is larger than the sum of its proper divisors (448936607869).

1661227515275 is a wasteful number, since it uses less digits than its factorization.

1661227515275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620709822 (or 1620709817 counting only the distinct ones).

The product of its digits is 1764000, while the sum is 50.

The spelling of 1661227515275 in words is "one trillion, six hundred sixty-one billion, two hundred twenty-seven million, five hundred fifteen thousand, two hundred seventy-five".