2157760025 has 6 divisors (see below), whose sum is σ = 2675622462. Its totient is φ = 1726208000.

The previous prime is 2157760021. The next prime is 2157760027. The reversal of 2157760025 is 5200677512.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 145250704 + 2012509321 = 12052^2 + 44861^2 .

It is not a de Polignac number, because 2157760025 - 2² = 2157760021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2157760021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43155176 + ... + 43155225.

It is an arithmetic number, because the mean of its divisors is an integer number (445937077).

Almost surely, 2^2157760025 is an apocalyptic number.

2157760025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2157760025 is a deficient number, since it is larger than the sum of its proper divisors (517862437).

2157760025 is an equidigital number, since it uses as much as digits as its factorization.

2157760025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86310411 (or 86310406 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 2157760025 is about 46451.6956095254. The cubic root of 2157760025 is about 1292.2138187420.

The spelling of 2157760025 in words is "two billion, one hundred fifty-seven million, seven hundred sixty thousand, twenty-five".