123351520157 has 2 divisors, whose sum is σ = 123351520158. Its totient is φ = 123351520156.

The previous prime is 123351520037. The next prime is 123351520177. The reversal of 123351520157 is 751025153321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106676704996 + 16674815161 = 326614^2 + 129131^2 .

It is a cyclic number.

It is not a de Polignac number, because 123351520157 - 2¹⁶ = 123351454621 is a prime.

It is a super-3 number, since 3×123351520157³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123351520177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61675760078 + 61675760079.

It is an arithmetic number, because the mean of its divisors is an integer number (61675760079).

Almost surely, 2^123351520157 is an apocalyptic number.

It is an amenable number.

123351520157 is a deficient number, since it is larger than the sum of its proper divisors (1).

123351520157 is an equidigital number, since it uses as much as digits as its factorization.

123351520157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31500, while the sum is 35.

Adding to 123351520157 its reverse (751025153321), we get a palindrome (874376673478).

The spelling of 123351520157 in words is "one hundred twenty-three billion, three hundred fifty-one million, five hundred twenty thousand, one hundred fifty-seven".