64155521 has 8 divisors (see below), whose sum is σ = 66331584. Its totient is φ = 62002800.

The previous prime is 64155491. The next prime is 64155551. The reversal of 64155521 is 12555146.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64155491) and next prime (64155551).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64155521 - 2²² = 59961217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64155551) 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, 155 + ... + 11328.

It is an arithmetic number, because the mean of its divisors is an integer number (8291448).

Almost surely, 2^64155521 is an apocalyptic number.

It is an amenable number.

64155521 is a deficient number, since it is larger than the sum of its proper divisors (2176063).

64155521 is a wasteful number, since it uses less digits than its factorization.

64155521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11671.

The product of its digits is 6000, while the sum is 29.

The square root of 64155521 is about 8009.7141646878. The cubic root of 64155521 is about 400.3237399937.

The spelling of 64155521 in words is "sixty-four million, one hundred fifty-five thousand, five hundred twenty-one".