64621007253 has 112 divisors (see below), whose sum is σ = 111414648960. Its totient is φ = 37079856000.

The previous prime is 64621007249. The next prime is 64621007261. The reversal of 64621007253 is 35270012646.

64621007253 is a `hidden beast` number, since 6 + 4 + 621 + 0 + 0 + 7 + 25 + 3 = 666.

It is not a de Polignac number, because 64621007253 - 2² = 64621007249 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64621008253) by changing a digit.

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 111 ways as a sum of consecutive naturals, for example, 18626403 + ... + 18629871.

Almost surely, 2^64621007253 is an apocalyptic number.

It is an amenable number.

64621007253 is a deficient number, since it is larger than the sum of its proper divisors (46793641707).

64621007253 is a wasteful number, since it uses less digits than its factorization.

64621007253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622 (or 3607 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

Adding to 64621007253 its reverse (35270012646), we get a palindrome (99891019899).

The spelling of 64621007253 in words is "sixty-four billion, six hundred twenty-one million, seven thousand, two hundred fifty-three".