720547979551 has 4 divisors (see below), whose sum is σ = 737304909352. Its totient is φ = 703791049752.

The previous prime is 720547979513. The next prime is 720547979561. The reversal of 720547979551 is 155979745027.

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

It is a cyclic number.

It is not a de Polignac number, because 720547979551 - 2¹⁷ = 720547848479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 720547979551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720547979561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8378464836 + ... + 8378464921.

It is an arithmetic number, because the mean of its divisors is an integer number (184326227338).

Almost surely, 2^720547979551 is an apocalyptic number.

720547979551 is a deficient number, since it is larger than the sum of its proper divisors (16756929801).

720547979551 is a wasteful number, since it uses less digits than its factorization.

720547979551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16756929800.

The product of its (nonzero) digits is 27783000, while the sum is 61.

The spelling of 720547979551 in words is "seven hundred twenty billion, five hundred forty-seven million, nine hundred seventy-nine thousand, five hundred fifty-one".