1565055501 has 4 divisors (see below), whose sum is σ = 2086740672. Its totient is φ = 1043370332.

The previous prime is 1565055473. The next prime is 1565055523. The reversal of 1565055501 is 1055505651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1565055501 - 2⁵ = 1565055469 is a prime.

It is a super-2 number, since 2×1565055501² = 4898797442420722002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1565055571) 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, 260842581 + ... + 260842586.

It is an arithmetic number, because the mean of its divisors is an integer number (521685168).

Almost surely, 2^1565055501 is an apocalyptic number.

It is an amenable number.

1565055501 is a deficient number, since it is larger than the sum of its proper divisors (521685171).

1565055501 is an equidigital number, since it uses as much as digits as its factorization.

1565055501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521685170.

The product of its (nonzero) digits is 18750, while the sum is 33.

The square root of 1565055501 is about 39560.7823608179. The cubic root of 1565055501 is about 1161.0294816913.

The spelling of 1565055501 in words is "one billion, five hundred sixty-five million, fifty-five thousand, five hundred one".