165102661553 has 4 divisors (see below), whose sum is σ = 166617364980. Its totient is φ = 163587958128.

The previous prime is 165102661531. The next prime is 165102661561. The reversal of 165102661553 is 355166201561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355166201561 = 67 ⋅5300988083.

It can be written as a sum of positive squares in 2 ways, for example, as 72268493584 + 92834167969 = 268828^2 + 304687^2 .

It is a cyclic number.

It is not a de Polignac number, because 165102661553 - 2⁶ = 165102661489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165102661553.

It is not an unprimeable number, because it can be changed into a prime (165102661523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757351550 + ... + 757351767.

It is an arithmetic number, because the mean of its divisors is an integer number (41654341245).

Almost surely, 2^165102661553 is an apocalyptic number.

It is an amenable number.

165102661553 is a deficient number, since it is larger than the sum of its proper divisors (1514703427).

165102661553 is a wasteful number, since it uses less digits than its factorization.

165102661553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514703426.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 165102661553 in words is "one hundred sixty-five billion, one hundred two million, six hundred sixty-one thousand, five hundred fifty-three".