1640142525 has 48 divisors (see below), whose sum is σ = 3104626688. Its totient is φ = 748440000.

The previous prime is 1640142523. The next prime is 1640142533. The reversal of 1640142525 is 5252410461.

It is not a de Polignac number, because 1640142525 - 2¹ = 1640142523 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1640142492 and 1640142501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640142523) 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, 328800 + ... + 333750.

Almost surely, 2^1640142525 is an apocalyptic number.

1640142525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1640142525 is a deficient number, since it is larger than the sum of its proper divisors (1464484163).

1640142525 is a wasteful number, since it uses less digits than its factorization.

1640142525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5602 (or 5597 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 1640142525 is about 40498.6731264124. The cubic root of 1640142525 is about 1179.3078687901.

Adding to 1640142525 its reverse (5252410461), we get a palindrome (6892552986).

The spelling of 1640142525 in words is "one billion, six hundred forty million, one hundred forty-two thousand, five hundred twenty-five".