166612621 has 8 divisors (see below), whose sum is σ = 198693504. Its totient is φ = 136601520.

The previous prime is 166612619. The next prime is 166612657. The reversal of 166612621 is 126216661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166612621 - 2¹ = 166612619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166612681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 517270 + ... + 517591.

It is an arithmetic number, because the mean of its divisors is an integer number (24836688).

Almost surely, 2^166612621 is an apocalyptic number.

It is an amenable number.

166612621 is a deficient number, since it is larger than the sum of its proper divisors (32080883).

166612621 is a wasteful number, since it uses less digits than its factorization.

166612621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034891.

The product of its digits is 5184, while the sum is 31.

The square root of 166612621 is about 12907.8511379703. The cubic root of 166612621 is about 550.2617167650.

The spelling of 166612621 in words is "one hundred sixty-six million, six hundred twelve thousand, six hundred twenty-one".