1964255857 has 4 divisors (see below), whose sum is σ = 1964352420. Its totient is φ = 1964159296.

The previous prime is 1964255849. The next prime is 1964255861. The reversal of 1964255857 is 7585524691.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7585524691 = 509 ⋅14902799.

It can be written as a sum of positive squares in 2 ways, for example, as 909565281 + 1054690576 = 30159^2 + 32476^2 .

It is a cyclic number.

It is not a de Polignac number, because 1964255857 - 2³ = 1964255849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1964253857) 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, 4588 + ... + 62845.

It is an arithmetic number, because the mean of its divisors is an integer number (491088105).

Almost surely, 2^1964255857 is an apocalyptic number.

It is an amenable number.

1964255857 is a deficient number, since it is larger than the sum of its proper divisors (96563).

1964255857 is an equidigital number, since it uses as much as digits as its factorization.

1964255857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96562.

The product of its digits is 3024000, while the sum is 52.

The square root of 1964255857 is about 44319.9261845053. The cubic root of 1964255857 is about 1252.3700861398.

The spelling of 1964255857 in words is "one billion, nine hundred sixty-four million, two hundred fifty-five thousand, eight hundred fifty-seven".