641672295552 has 120 divisors (see below), whose sum is σ = 1909849121235. Its totient is φ = 213863576832.

The previous prime is 641672295493. The next prime is 641672295569. The reversal of 641672295552 is 255592276146.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

641672295552 is a `hidden beast` number, since 6 + 4 + 1 + 67 + 2 + 29 + 5 + 552 = 666.

It can be written as a sum of positive squares in only one way, i.e., 320836147776 + 320836147776 = 566424^2 + 566424^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=566424.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 81561123 + ... + 81568989.

Almost surely, 2^641672295552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641672295552

641672295552 is an abundant number, since it is smaller than the sum of its proper divisors (1268176825683).

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

641672295552 is an frugal number, since it uses more digits than its factorization.

641672295552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15760 (or 7872 counting only the distinct ones).

The product of its digits is 9072000, while the sum is 54.

The spelling of 641672295552 in words is "six hundred forty-one billion, six hundred seventy-two million, two hundred ninety-five thousand, five hundred fifty-two".