166701851651 has 2 divisors, whose sum is σ = 166701851652. Its totient is φ = 166701851650.

The previous prime is 166701851627. The next prime is 166701851747. The reversal of 166701851651 is 156158107661.

It is a weak prime.

It is an emirp because it is prime and its reverse (156158107661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166701851651 is a prime.

It is a super-2 number, since 2×166701851651² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166701851596 and 166701851605.

It is not a weakly prime, because it can be changed into another prime (166701551651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83350925825 + 83350925826.

It is an arithmetic number, because the mean of its divisors is an integer number (83350925826).

Almost surely, 2^166701851651 is an apocalyptic number.

166701851651 is a deficient number, since it is larger than the sum of its proper divisors (1).

166701851651 is an equidigital number, since it uses as much as digits as its factorization.

166701851651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 47.

The spelling of 166701851651 in words is "one hundred sixty-six billion, seven hundred one million, eight hundred fifty-one thousand, six hundred fifty-one".