390640681545 has 16 divisors (see below), whose sum is σ = 625065456960. Its totient is φ = 208328241344.

The previous prime is 390640681507. The next prime is 390640681547. The reversal of 390640681545 is 545186046093.

It is a cyclic number.

It is not a de Polignac number, because 390640681545 - 2⁶ = 390640681481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (390640681547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 598719 + ... + 1067588.

It is an arithmetic number, because the mean of its divisors is an integer number (39066591060).

Almost surely, 2^390640681545 is an apocalyptic number.

It is an amenable number.

390640681545 is a deficient number, since it is larger than the sum of its proper divisors (234424775415).

390640681545 is a wasteful number, since it uses less digits than its factorization.

390640681545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681944.

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 390640681545 in words is "three hundred ninety billion, six hundred forty million, six hundred eighty-one thousand, five hundred forty-five".