2691155560 has 32 divisors (see below), whose sum is σ = 6169352040. Its totient is φ = 1056150784.

The previous prime is 2691155557. The next prime is 2691155569. The reversal of 2691155560 is 655511962.

It can be written as a sum of positive squares in 4 ways, for example, as 2047924516 + 643231044 = 45254^2 + 25362^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (2691155569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632587 + ... + 636826.

Almost surely, 2^2691155560 is an apocalyptic number.

2691155560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2691155560 is an abundant number, since it is smaller than the sum of its proper divisors (3478196480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2691155560 is a wasteful number, since it uses less digits than its factorization.

2691155560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269477 (or 1269473 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 40.

The square root of 2691155560 is about 51876.3487535505. The cubic root of 2691155560 is about 1390.9545330132.

The spelling of 2691155560 in words is "two billion, six hundred ninety-one million, one hundred fifty-five thousand, five hundred sixty".