640261502045 has 16 divisors (see below), whose sum is σ = 838183584960. Its totient is φ = 465631910400.

The previous prime is 640261502033. The next prime is 640261502063. The reversal of 640261502045 is 540205162046.

It is not a de Polignac number, because 640261502045 - 2¹² = 640261497949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640261501996 and 640261502014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2158061 + ... + 2436749.

It is an arithmetic number, because the mean of its divisors is an integer number (52386474060).

Almost surely, 2^640261502045 is an apocalyptic number.

It is an amenable number.

640261502045 is a deficient number, since it is larger than the sum of its proper divisors (197922082915).

640261502045 is a wasteful number, since it uses less digits than its factorization.

640261502045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320476.

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 640261502045 in words is "six hundred forty billion, two hundred sixty-one million, five hundred two thousand, forty-five".