156666952049 has 4 divisors (see below), whose sum is σ = 158282075364. Its totient is φ = 155051828736.

The previous prime is 156666952021. The next prime is 156666952069. The reversal of 156666952049 is 940259666651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 940259666651 = 37 ⋅25412423423.

It can be written as a sum of positive squares in 2 ways, for example, as 24194247025 + 132472705024 = 155545^2 + 363968^2 .

It is a cyclic number.

It is not a de Polignac number, because 156666952049 - 2¹² = 156666947953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156666952069) 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, 807561512 + ... + 807561705.

It is an arithmetic number, because the mean of its divisors is an integer number (39570518841).

Almost surely, 2^156666952049 is an apocalyptic number.

It is an amenable number.

156666952049 is a deficient number, since it is larger than the sum of its proper divisors (1615123315).

156666952049 is an equidigital number, since it uses as much as digits as its factorization.

156666952049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615123314.

The product of its (nonzero) digits is 20995200, while the sum is 59.

The spelling of 156666952049 in words is "one hundred fifty-six billion, six hundred sixty-six million, nine hundred fifty-two thousand, forty-nine".