151665750901666 has 4 divisors (see below), whose sum is σ = 227498626352502. Its totient is φ = 75832875450832.

The previous prime is 151665750901631. The next prime is 151665750901727. The reversal of 151665750901666 is 666109057566151.

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

It can be written as a sum of positive squares in only one way, i.e., 132227483958441 + 19438266943225 = 11499021^2 + 4408885^2 .

It is a junction number, because it is equal to n+sod(n) for n = 151665750901598 and 151665750901607.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37916437725415 + ... + 37916437725418.

Almost surely, 2^{151665750901666} is an apocalyptic number.

151665750901666 is a deficient number, since it is larger than the sum of its proper divisors (75832875450836).

151665750901666 is an equidigital number, since it uses as much as digits as its factorization.

151665750901666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75832875450835.

The product of its (nonzero) digits is 61236000, while the sum is 64.

The spelling of 151665750901666 in words is "one hundred fifty-one trillion, six hundred sixty-five billion, seven hundred fifty million, nine hundred one thousand, six hundred sixty-six".