655070721 has 8 divisors (see below), whose sum is σ = 879711840. Its totient is φ = 433571712.

The previous prime is 655070719. The next prime is 655070723. The reversal of 655070721 is 127070556.

It is an interprime number because it is at equal distance from previous prime (655070719) and next prime (655070723).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 655070721 - 2¹ = 655070719 is a prime.

It is a super-2 number, since 2×655070721² = 858235299022919682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (655070723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 785040 + ... + 785873.

It is an arithmetic number, because the mean of its divisors is an integer number (109963980).

Almost surely, 2^655070721 is an apocalyptic number.

It is an amenable number.

655070721 is a deficient number, since it is larger than the sum of its proper divisors (224641119).

655070721 is a wasteful number, since it uses less digits than its factorization.

655070721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571055.

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 655070721 is about 25594.3493959116. The cubic root of 655070721 is about 868.4858151138.

The spelling of 655070721 in words is "six hundred fifty-five million, seventy thousand, seven hundred twenty-one".