10123720157 has 2 divisors, whose sum is σ = 10123720158. Its totient is φ = 10123720156.

The previous prime is 10123720121. The next prime is 10123720207. The reversal of 10123720157 is 75102732101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10049260516 + 74459641 = 100246^2 + 8629^2 .

It is an emirp because it is prime and its reverse (75102732101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10123720157 - 2¹⁴ = 10123703773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10123720357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5061860078 + 5061860079.

It is an arithmetic number, because the mean of its divisors is an integer number (5061860079).

Almost surely, 2^10123720157 is an apocalyptic number.

It is an amenable number.

10123720157 is a deficient number, since it is larger than the sum of its proper divisors (1).

10123720157 is an equidigital number, since it uses as much as digits as its factorization.

10123720157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 29.

The spelling of 10123720157 in words is "ten billion, one hundred twenty-three million, seven hundred twenty thousand, one hundred fifty-seven".