2151065640 has 32 divisors (see below), whose sum is σ = 6453197280. Its totient is φ = 573617472.

The previous prime is 2151065617. The next prime is 2151065671. The reversal of 2151065640 is 465601512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2151065598 and 2151065607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8962654 + ... + 8962893.

It is an arithmetic number, because the mean of its divisors is an integer number (201662415).

Almost surely, 2^2151065640 is an apocalyptic number.

2151065640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2151065640 is an abundant number, since it is smaller than the sum of its proper divisors (4302131640).

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

2151065640 is a wasteful number, since it uses less digits than its factorization.

2151065640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17925561 (or 17925557 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 2151065640 is about 46379.5821455951. The cubic root of 2151065640 is about 1290.8760829718.

The spelling of 2151065640 in words is "two billion, one hundred fifty-one million, sixty-five thousand, six hundred forty".