2665026540 has 72 divisors (see below), whose sum is σ = 8818821648. Its totient is φ = 646066560.

The previous prime is 2665026517. The next prime is 2665026557. The reversal of 2665026540 is 456205662.

2665026540 is a `hidden beast` number, since 2 + 66 + 50 + 2 + 6 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2665026495 and 2665026504.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 671007 + ... + 674966.

It is an arithmetic number, because the mean of its divisors is an integer number (122483634).

Almost surely, 2^2665026540 is an apocalyptic number.

2665026540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2665026540 is an abundant number, since it is smaller than the sum of its proper divisors (6153795108).

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

2665026540 is a wasteful number, since it uses less digits than its factorization.

2665026540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345999 (or 1345994 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 2665026540 is about 51623.8950487078. The cubic root of 2665026540 is about 1386.4381903164.

The spelling of 2665026540 in words is "two billion, six hundred sixty-five million, twenty-six thousand, five hundred forty".