2157997512 has 64 divisors (see below), whose sum is σ = 5943792960. Its totient is φ = 647456000.

The previous prime is 2157997487. The next prime is 2157997531.

It is a happy number.

2157997512 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13803 + ... + 67130.

It is an arithmetic number, because the mean of its divisors is an integer number (92871765).

Almost surely, 2^2157997512 is an apocalyptic number.

2157997512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2157997512 is an abundant number, since it is smaller than the sum of its proper divisors (3785795448).

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

2157997512 is a wasteful number, since it uses less digits than its factorization.

2157997512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81054 (or 81050 counting only the distinct ones).

The product of its digits is 396900, while the sum is 48.

The square root of 2157997512 is about 46454.2518183212. The cubic root of 2157997512 is about 1292.2612248053.

The spelling of 2157997512 in words is "two billion, one hundred fifty-seven million, nine hundred ninety-seven thousand, five hundred twelve".