647499891973 has 8 divisors (see below), whose sum is σ = 706910678496. Its totient is φ = 588180298800.

The previous prime is 647499891887. The next prime is 647499891979. The reversal of 647499891973 is 379198994746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 647499891973 - 2³⁷ = 510060938501 is a prime.

It is a super-2 number, since 2×647499891973² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 647499891973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647499891979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22783486 + ... + 22811887.

It is an arithmetic number, because the mean of its divisors is an integer number (88363834812).

Almost surely, 2^647499891973 is an apocalyptic number.

It is an amenable number.

647499891973 is a deficient number, since it is larger than the sum of its proper divisors (59410786523).

647499891973 is a wasteful number, since it uses less digits than its factorization.

647499891973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45596675.

The product of its digits is 740710656, while the sum is 76.

The spelling of 647499891973 in words is "six hundred forty-seven billion, four hundred ninety-nine million, eight hundred ninety-one thousand, nine hundred seventy-three".