2545155561 has 32 divisors (see below), whose sum is σ = 3918620160. Its totient is φ = 1455427584.

The previous prime is 2545155541. The next prime is 2545155581. The reversal of 2545155561 is 1655515452.

It is an interprime number because it is at equal distance from previous prime (2545155541) and next prime (2545155581).

It is not a de Polignac number, because 2545155561 - 2⁶ = 2545155497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (2545155541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28081 + ... + 76673.

It is an arithmetic number, because the mean of its divisors is an integer number (122456880).

Almost surely, 2^2545155561 is an apocalyptic number.

It is an amenable number.

2545155561 is a deficient number, since it is larger than the sum of its proper divisors (1373464599).

2545155561 is a wasteful number, since it uses less digits than its factorization.

2545155561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48705.

The product of its digits is 150000, while the sum is 39.

The square root of 2545155561 is about 50449.5347946837. The cubic root of 2545155561 is about 1365.3315015543.

The spelling of 2545155561 in words is "two billion, five hundred forty-five million, one hundred fifty-five thousand, five hundred sixty-one".