157420237291 has 4 divisors (see below), whose sum is σ = 157550016112. Its totient is φ = 157290458472.

The previous prime is 157420237253. The next prime is 157420237307. The reversal of 157420237291 is 192732024751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192732024751 = 7 ⋅27533146393.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157420237291 is a prime.

It is a super-2 number, since 2×157420237291² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157420237211) 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, 64887591 + ... + 64890016.

It is an arithmetic number, because the mean of its divisors is an integer number (39387504028).

Almost surely, 2^157420237291 is an apocalyptic number.

157420237291 is a deficient number, since it is larger than the sum of its proper divisors (129778821).

157420237291 is a wasteful number, since it uses less digits than its factorization.

157420237291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129778820.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 157420237291 in words is "one hundred fifty-seven billion, four hundred twenty million, two hundred thirty-seven thousand, two hundred ninety-one".