2155480765 has 16 divisors (see below), whose sum is σ = 2729376000. Its totient is φ = 1630870912.

The previous prime is 2155480751. The next prime is 2155480787. The reversal of 2155480765 is 5670845512.

It is a cyclic number.

It is not a de Polignac number, because 2155480765 - 2²¹ = 2153383613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95065 + ... + 115534.

It is an arithmetic number, because the mean of its divisors is an integer number (170586000).

Almost surely, 2^2155480765 is an apocalyptic number.

It is an amenable number.

2155480765 is a deficient number, since it is larger than the sum of its proper divisors (573895235).

2155480765 is a wasteful number, since it uses less digits than its factorization.

2155480765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210716.

The product of its (nonzero) digits is 336000, while the sum is 43.

The square root of 2155480765 is about 46427.1554696171. The cubic root of 2155480765 is about 1291.7586663480.

The spelling of 2155480765 in words is "two billion, one hundred fifty-five million, four hundred eighty thousand, seven hundred sixty-five".