157161801343561 has 9 divisors (see below), whose sum is σ = 182820973032999. Its totient is φ = 134710040218824.

The previous prime is 157161801343483. The next prime is 157161801343579. The reversal of 157161801343561 is 165343108161751.

The square root of 157161801343561 is 12536419.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 24938388007225 + 132223413336336 = 4993835^2 + 11498844^2 .

It is not a de Polignac number, because 157161801343561 - 2¹⁵ = 157161801310793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 157161801343499 and 157161801343508.

It is not an unprimeable number, because it can be changed into a prime (157161801343361) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 86859475 + ... + 88650391.

It is an arithmetic number, because the mean of its divisors is an integer number (20313441448111).

Almost surely, 2^{157161801343561} is an apocalyptic number.

157161801343561 is the 12536419-th square number.

157161801343561 is the 6268210-th centered octagonal number.

It is an amenable number.

157161801343561 is a deficient number, since it is larger than the sum of its proper divisors (25659171689438).

157161801343561 is an frugal number, since it uses more digits than its factorization.

157161801343561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581848 (or 1790924 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 157161801343561 in words is "one hundred fifty-seven trillion, one hundred sixty-one billion, eight hundred one million, three hundred forty-three thousand, five hundred sixty-one".