2157625651 has 4 divisors (see below), whose sum is σ = 2157736672. Its totient is φ = 2157514632.

The previous prime is 2157625583. The next prime is 2157625667. The reversal of 2157625651 is 1565267512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2157625651 - 2⁹ = 2157625139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157625681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17835 + ... + 68068.

It is an arithmetic number, because the mean of its divisors is an integer number (539434168).

Almost surely, 2^2157625651 is an apocalyptic number.

2157625651 is a deficient number, since it is larger than the sum of its proper divisors (111021).

2157625651 is an equidigital number, since it uses as much as digits as its factorization.

2157625651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111020.

The product of its digits is 126000, while the sum is 40.

The square root of 2157625651 is about 46450.2492027761. The cubic root of 2157625651 is about 1292.1869940809.

The spelling of 2157625651 in words is "two billion, one hundred fifty-seven million, six hundred twenty-five thousand, six hundred fifty-one".