155663653 has 4 divisors (see below), whose sum is σ = 158302080. Its totient is φ = 153025228.

The previous prime is 155663639. The next prime is 155663659. The reversal of 155663653 is 356366551.

155663653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 155663653 - 2⁹ = 155663141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155663659) 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, 1319125 + ... + 1319242.

It is an arithmetic number, because the mean of its divisors is an integer number (39575520).

Almost surely, 2^155663653 is an apocalyptic number.

It is an amenable number.

155663653 is a deficient number, since it is larger than the sum of its proper divisors (2638427).

155663653 is an equidigital number, since it uses as much as digits as its factorization.

155663653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638426.

The product of its digits is 243000, while the sum is 40.

The square root of 155663653 is about 12476.5240752383. The cubic root of 155663653 is about 537.9340966246.

The spelling of 155663653 in words is "one hundred fifty-five million, six hundred sixty-three thousand, six hundred fifty-three".