2151246640 has 60 divisors (see below), whose sum is σ = 5313226896. Its totient is φ = 809872384.

The previous prime is 2151246607. The next prime is 2151246641. The reversal of 2151246640 is 466421512.

It is a happy number.

It is a super-2 number, since 2×2151246640² = 9255724212222579200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2151246641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23404 + ... + 69643.

Almost surely, 2^2151246640 is an apocalyptic number.

2151246640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2151246640 is an abundant number, since it is smaller than the sum of its proper divisors (3161980256).

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

2151246640 is a wasteful number, since it uses less digits than its factorization.

2151246640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93094 (or 93071 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 2151246640 is about 46381.5333942292. The cubic root of 2151246640 is about 1290.9122885952.

The spelling of 2151246640 in words is "two billion, one hundred fifty-one million, two hundred forty-six thousand, six hundred forty".