72471021749 has 4 divisors (see below), whose sum is σ = 82824024864. Its totient is φ = 62118018636.

The previous prime is 72471021739. The next prime is 72471021773. The reversal of 72471021749 is 94712017427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72471021749 - 2¹⁶ = 72470956213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72471021739) 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, 5176501547 + ... + 5176501560.

It is an arithmetic number, because the mean of its divisors is an integer number (20706006216).

Almost surely, 2^72471021749 is an apocalyptic number.

It is an amenable number.

72471021749 is a deficient number, since it is larger than the sum of its proper divisors (10353003115).

72471021749 is a wasteful number, since it uses less digits than its factorization.

72471021749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10353003114.

The product of its (nonzero) digits is 197568, while the sum is 44.

The spelling of 72471021749 in words is "seventy-two billion, four hundred seventy-one million, twenty-one thousand, seven hundred forty-nine".