64153890265 has 4 divisors (see below), whose sum is σ = 76984668324. Its totient is φ = 51323112208.

The previous prime is 64153890263. The next prime is 64153890293. The reversal of 64153890265 is 56209835146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56209835146 = 2 ⋅28104917573.

It can be written as a sum of positive squares in 2 ways, for example, as 37764537561 + 26389352704 = 194331^2 + 162448^2 .

It is a cyclic number.

It is not a de Polignac number, because 64153890265 - 2¹ = 64153890263 is a prime.

It is a super-2 number, since 2×64153890265² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64153890263) 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, 6415389022 + ... + 6415389031.

It is an arithmetic number, because the mean of its divisors is an integer number (19246167081).

Almost surely, 2^64153890265 is an apocalyptic number.

It is an amenable number.

64153890265 is a deficient number, since it is larger than the sum of its proper divisors (12830778059).

64153890265 is a wasteful number, since it uses less digits than its factorization.

64153890265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12830778058.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 64153890265 in words is "sixty-four billion, one hundred fifty-three million, eight hundred ninety thousand, two hundred sixty-five".