63172879491 has 4 divisors (see below), whose sum is σ = 84230505992. Its totient is φ = 42115252992.

The previous prime is 63172879457. The next prime is 63172879507. The reversal of 63172879491 is 19497827136.

It is a happy number.

63172879491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 63172879491 - 2¹⁹ = 63172355203 is a prime.

It is a super-3 number, since 3×63172879491³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63172878491) 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, 10528813246 + ... + 10528813251.

It is an arithmetic number, because the mean of its divisors is an integer number (21057626498).

Almost surely, 2^63172879491 is an apocalyptic number.

63172879491 is a deficient number, since it is larger than the sum of its proper divisors (21057626501).

63172879491 is a wasteful number, since it uses less digits than its factorization.

63172879491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21057626500.

The product of its digits is 4572288, while the sum is 57.

The spelling of 63172879491 in words is "sixty-three billion, one hundred seventy-two million, eight hundred seventy-nine thousand, four hundred ninety-one".