42721567647 has 96 divisors (see below), whose sum is σ = 68409411840. Its totient is φ = 23601177600.

The previous prime is 42721567643. The next prime is 42721567657. The reversal of 42721567647 is 74676512724.

It is not a de Polignac number, because 42721567647 - 2² = 42721567643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 42721567647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42721567643) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 34760629 + ... + 34761857.

It is an arithmetic number, because the mean of its divisors is an integer number (712598040).

Almost surely, 2^42721567647 is an apocalyptic number.

42721567647 is a deficient number, since it is larger than the sum of its proper divisors (25687844193).

42721567647 is a wasteful number, since it uses less digits than its factorization.

42721567647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445 (or 1434 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 51.

The spelling of 42721567647 in words is "forty-two billion, seven hundred twenty-one million, five hundred sixty-seven thousand, six hundred forty-seven".