5166001661 has 4 divisors (see below), whose sum is σ = 5166541632. Its totient is φ = 5165461692.

The previous prime is 5166001651. The next prime is 5166001691. The reversal of 5166001661 is 1661006615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5166001661 - 2¹⁴ = 5165985277 is a prime.

It is a super-2 number, since 2×5166001661² = 53375146322909517842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5166001651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255371 + ... + 274856.

It is an arithmetic number, because the mean of its divisors is an integer number (1291635408).

Almost surely, 2^5166001661 is an apocalyptic number.

It is an amenable number.

5166001661 is a deficient number, since it is larger than the sum of its proper divisors (539971).

5166001661 is an equidigital number, since it uses as much as digits as its factorization.

5166001661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539970.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 5166001661 is about 71874.9028590648. The cubic root of 5166001661 is about 1728.6942223250.

The spelling of 5166001661 in words is "five billion, one hundred sixty-six million, one thousand, six hundred sixty-one".