640174551451 has 2 divisors, whose sum is σ = 640174551452. Its totient is φ = 640174551450.

The previous prime is 640174551433. The next prime is 640174551479. The reversal of 640174551451 is 154155471046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640174551451 - 2¹³ = 640174543259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640174551398 and 640174551407.

It is not a weakly prime, because it can be changed into another prime (640174554451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320087275725 + 320087275726.

It is an arithmetic number, because the mean of its divisors is an integer number (320087275726).

Almost surely, 2^640174551451 is an apocalyptic number.

640174551451 is a deficient number, since it is larger than the sum of its proper divisors (1).

640174551451 is an equidigital number, since it uses as much as digits as its factorization.

640174551451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336000, while the sum is 43.

The spelling of 640174551451 in words is "six hundred forty billion, one hundred seventy-four million, five hundred fifty-one thousand, four hundred fifty-one".