2661557505 has 32 divisors (see below), whose sum is σ = 4415472000. Its totient is φ = 1367396352.

The previous prime is 2661557497. The next prime is 2661557533. The reversal of 2661557505 is 5057551662.

It is a happy number.

It is not a de Polignac number, because 2661557505 - 2³ = 2661557497 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188502 + ... + 202128.

It is an arithmetic number, because the mean of its divisors is an integer number (137983500).

Almost surely, 2^2661557505 is an apocalyptic number.

It is an amenable number.

2661557505 is a deficient number, since it is larger than the sum of its proper divisors (1753914495).

2661557505 is a wasteful number, since it uses less digits than its factorization.

2661557505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14113.

The product of its (nonzero) digits is 315000, while the sum is 42.

The square root of 2661557505 is about 51590.2849866135. The cubic root of 2661557505 is about 1385.8363587881.

The spelling of 2661557505 in words is "two billion, six hundred sixty-one million, five hundred fifty-seven thousand, five hundred five".