7557397073 has 4 divisors (see below), whose sum is σ = 8001949860. Its totient is φ = 7112844288.

The previous prime is 7557397069. The next prime is 7557397087. The reversal of 7557397073 is 3707937557.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5093962384 + 2463434689 = 71372^2 + 49633^2 .

It is a cyclic number.

It is not a de Polignac number, because 7557397073 - 2² = 7557397069 is a prime.

It is a super-2 number, since 2×7557397073² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7557397033) 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, 222276368 + ... + 222276401.

It is an arithmetic number, because the mean of its divisors is an integer number (2000487465).

Almost surely, 2^7557397073 is an apocalyptic number.

It is an amenable number.

7557397073 is a deficient number, since it is larger than the sum of its proper divisors (444552787).

7557397073 is a wasteful number, since it uses less digits than its factorization.

7557397073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444552786.

The product of its (nonzero) digits is 4862025, while the sum is 53.

The square root of 7557397073 is about 86933.2909362115. The cubic root of 7557397073 is about 1962.4145129868.

The spelling of 7557397073 in words is "seven billion, five hundred fifty-seven million, three hundred ninety-seven thousand, seventy-three".