1640255253 has 48 divisors (see below), whose sum is σ = 2803622976. Its totient is φ = 845026560.

The previous prime is 1640255203. The next prime is 1640255261. The reversal of 1640255253 is 3525520461.

It is not a de Polignac number, because 1640255253 - 2¹³ = 1640247061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640255203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72193 + ... + 92153.

It is an arithmetic number, because the mean of its divisors is an integer number (58408812).

Almost surely, 2^1640255253 is an apocalyptic number.

1640255253 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1640255253 is a deficient number, since it is larger than the sum of its proper divisors (1163367723).

1640255253 is a wasteful number, since it uses less digits than its factorization.

1640255253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20034 (or 20027 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 1640255253 is about 40500.0648517999. The cubic root of 1640255253 is about 1179.3348863551.

The spelling of 1640255253 in words is "one billion, six hundred forty million, two hundred fifty-five thousand, two hundred fifty-three".