2118640425 has 72 divisors (see below), whose sum is σ = 3877335168. Its totient is φ = 1019990400.

The previous prime is 2118640397. The next prime is 2118640427. The reversal of 2118640425 is 5240468112.

It is a happy number.

It is not a de Polignac number, because 2118640425 - 2⁸ = 2118640169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (2118640427) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1424032 + ... + 1425518.

Almost surely, 2^2118640425 is an apocalyptic number.

2118640425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2118640425 is a deficient number, since it is larger than the sum of its proper divisors (1758694743).

2118640425 is a wasteful number, since it uses less digits than its factorization.

2118640425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1663 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 2118640425 is about 46028.6913239992. The cubic root of 2118640425 is about 1284.3569837220.

The spelling of 2118640425 in words is "two billion, one hundred eighteen million, six hundred forty thousand, four hundred twenty-five".