645270207061 has 4 divisors (see below), whose sum is σ = 645855221952. Its totient is φ = 644685192172.

The previous prime is 645270207059. The next prime is 645270207067. The reversal of 645270207061 is 160702072546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 645270207061 - 2¹ = 645270207059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645270207067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292505791 + ... + 292507996.

It is an arithmetic number, because the mean of its divisors is an integer number (161463805488).

Almost surely, 2^645270207061 is an apocalyptic number.

It is an amenable number.

645270207061 is a deficient number, since it is larger than the sum of its proper divisors (585014891).

645270207061 is a wasteful number, since it uses less digits than its factorization.

645270207061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585014890.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 645270207061 in words is "six hundred forty-five billion, two hundred seventy million, two hundred seven thousand, sixty-one".