645472695340 has 48 divisors (see below), whose sum is σ = 1479938937120. Its totient is φ = 234523745280.

The previous prime is 645472695331. The next prime is 645472695347. The reversal of 645472695340 is 43596274546.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (645472695347) 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, 942525 + ... + 1476244.

It is an arithmetic number, because the mean of its divisors is an integer number (30832061190).

Almost surely, 2^645472695340 is an apocalyptic number.

It is an amenable number.

645472695340 is an abundant number, since it is smaller than the sum of its proper divisors (834466241780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645472695340 is a wasteful number, since it uses less digits than its factorization.

645472695340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420002 (or 2420000 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 55.

The spelling of 645472695340 in words is "six hundred forty-five billion, four hundred seventy-two million, six hundred ninety-five thousand, three hundred forty".