165515401363 has 4 divisors (see below), whose sum is σ = 178247355328. Its totient is φ = 152783447400.

The previous prime is 165515401361. The next prime is 165515401409. The reversal of 165515401363 is 363104515561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 363104515561 = 113 ⋅3213314297.

It is a cyclic number.

It is not a de Polignac number, because 165515401363 - 2¹ = 165515401361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165515401361) 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, 6365976963 + ... + 6365976988.

It is an arithmetic number, because the mean of its divisors is an integer number (44561838832).

Almost surely, 2^165515401363 is an apocalyptic number.

165515401363 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

165515401363 is a deficient number, since it is larger than the sum of its proper divisors (12731953965).

165515401363 is a wasteful number, since it uses less digits than its factorization.

165515401363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12731953964.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 165515401363 in words is "one hundred sixty-five billion, five hundred fifteen million, four hundred one thousand, three hundred sixty-three".