645622012461 has 128 divisors (see below), whose sum is σ = 978237849600. Its totient is φ = 377040199680.

The previous prime is 645622012457. The next prime is 645622012507. The reversal of 645622012461 is 164210226546.

It is not a de Polignac number, because 645622012461 - 2² = 645622012457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645622012561) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 660820405 + ... + 660821381.

It is an arithmetic number, because the mean of its divisors is an integer number (7642483200).

Almost surely, 2^645622012461 is an apocalyptic number.

It is an amenable number.

645622012461 is a deficient number, since it is larger than the sum of its proper divisors (332615837139).

645622012461 is a wasteful number, since it uses less digits than its factorization.

645622012461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259.

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 645622012461 in words is "six hundred forty-five billion, six hundred twenty-two million, twelve thousand, four hundred sixty-one".