157181666401 has 4 divisors (see below), whose sum is σ = 157184452804. Its totient is φ = 157178880000.

The previous prime is 157181666399. The next prime is 157181666417. The reversal of 157181666401 is 104666181751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 142691285025 + 14490381376 = 377745^2 + 120376^2 .

It is a cyclic number.

It is not a de Polignac number, because 157181666401 - 2¹ = 157181666399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157181666471) 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, 1306800 + ... + 1422001.

It is an arithmetic number, because the mean of its divisors is an integer number (39296113201).

Almost surely, 2^157181666401 is an apocalyptic number.

It is an amenable number.

157181666401 is a deficient number, since it is larger than the sum of its proper divisors (2786403).

157181666401 is an equidigital number, since it uses as much as digits as its factorization.

157181666401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786402.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 157181666401 in words is "one hundred fifty-seven billion, one hundred eighty-one million, six hundred sixty-six thousand, four hundred one".