165640454 has 16 divisors (see below), whose sum is σ = 284121600. Its totient is φ = 70947144.

The previous prime is 165640441. The next prime is 165640459. The reversal of 165640454 is 454046561.

It is a super-2 number, since 2×165640454² = 54873520002652232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165640459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40307 + ... + 44225.

It is an arithmetic number, because the mean of its divisors is an integer number (17757600).

Almost surely, 2^165640454 is an apocalyptic number.

165640454 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

165640454 is a deficient number, since it is larger than the sum of its proper divisors (118481146).

165640454 is a wasteful number, since it uses less digits than its factorization.

165640454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6947.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 165640454 is about 12870.1380722974. The cubic root of 165640454 is about 549.1893887970.

The spelling of 165640454 in words is "one hundred sixty-five million, six hundred forty thousand, four hundred fifty-four".