157772245 has 4 divisors (see below), whose sum is σ = 189326700. Its totient is φ = 126217792.

The previous prime is 157772233. The next prime is 157772261. The reversal of 157772245 is 542277751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542277751 = 4801 ⋅112951.

It can be written as a sum of positive squares in 2 ways, for example, as 82464561 + 75307684 = 9081^2 + 8678^2 .

It is a cyclic number.

It is not a de Polignac number, because 157772245 - 2⁵ = 157772213 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 157772198 and 157772207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15777220 + ... + 15777229.

It is an arithmetic number, because the mean of its divisors is an integer number (47331675).

Almost surely, 2^157772245 is an apocalyptic number.

It is an amenable number.

157772245 is a deficient number, since it is larger than the sum of its proper divisors (31554455).

157772245 is an equidigital number, since it uses as much as digits as its factorization.

157772245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31554454.

The product of its digits is 137200, while the sum is 40.

The square root of 157772245 is about 12560.7422153311. The cubic root of 157772245 is about 540.3521308671.

The spelling of 157772245 in words is "one hundred fifty-seven million, seven hundred seventy-two thousand, two hundred forty-five".