1634640025 has 12 divisors (see below), whose sum is σ = 2070081792. Its totient is φ = 1279887440.

The previous prime is 1634640001. The next prime is 1634640037. The reversal of 1634640025 is 5200464361.

It is not a de Polignac number, because 1634640025 - 2¹³ = 1634631833 is a prime.

It is a super-2 number, since 2×1634640025² = 5344096022664001250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 694417 + ... + 696766.

It is an arithmetic number, because the mean of its divisors is an integer number (172506816).

Almost surely, 2^1634640025 is an apocalyptic number.

It is an amenable number.

1634640025 is a deficient number, since it is larger than the sum of its proper divisors (435441767).

1634640025 is a wasteful number, since it uses less digits than its factorization.

1634640025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391240 (or 1391235 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 1634640025 is about 40430.6817281134. The cubic root of 1634640025 is about 1177.9875746098.

The spelling of 1634640025 in words is "one billion, six hundred thirty-four million, six hundred forty thousand, twenty-five".