722151557 has 4 divisors (see below), whose sum is σ = 722219520. Its totient is φ = 722083596.

The previous prime is 722151511. The next prime is 722151581. The reversal of 722151557 is 755151227.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 755151227 = 31 ⋅24359717.

It is a cyclic number.

It is not a de Polignac number, because 722151557 - 2¹⁶ = 722086021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722151257) 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, 14207 + ... + 40572.

It is an arithmetic number, because the mean of its divisors is an integer number (180554880).

Almost surely, 2^722151557 is an apocalyptic number.

It is an amenable number.

722151557 is a deficient number, since it is larger than the sum of its proper divisors (67963).

722151557 is a wasteful number, since it uses less digits than its factorization.

722151557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67962.

The product of its digits is 24500, while the sum is 35.

The square root of 722151557 is about 26872.8777208545. The cubic root of 722151557 is about 897.1728390666.

The spelling of 722151557 in words is "seven hundred twenty-two million, one hundred fifty-one thousand, five hundred fifty-seven".