1640325825781 has 8 divisors (see below), whose sum is σ = 1727189618720. Its totient is φ = 1553515118352.

The previous prime is 1640325825779. The next prime is 1640325825833. The reversal of 1640325825781 is 1875285230461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1640325825781 - 2¹ = 1640325825779 is a prime.

It is a super-2 number, since 2×1640325825781² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640325825751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13207935 + ... + 13331548.

It is an arithmetic number, because the mean of its divisors is an integer number (215898702340).

Almost surely, 2^{1640325825781} is an apocalyptic number.

It is an amenable number.

1640325825781 is a deficient number, since it is larger than the sum of its proper divisors (86863792939).

1640325825781 is a wasteful number, since it uses less digits than its factorization.

1640325825781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26542755.

The product of its (nonzero) digits is 3225600, while the sum is 52.

The spelling of 1640325825781 in words is "one trillion, six hundred forty billion, three hundred twenty-five million, eight hundred twenty-five thousand, seven hundred eighty-one".