172770661 has 8 divisors (see below), whose sum is σ = 204261120. Its totient is φ = 142982448.

The previous prime is 172770659. The next prime is 172770683. The reversal of 172770661 is 166077271.

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

It is not a de Polignac number, because 172770661 - 2¹ = 172770659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172770661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172770601) 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, 425341 + ... + 425746.

It is an arithmetic number, because the mean of its divisors is an integer number (25532640).

Almost surely, 2^172770661 is an apocalyptic number.

It is an amenable number.

172770661 is a deficient number, since it is larger than the sum of its proper divisors (31490459).

172770661 is an equidigital number, since it uses as much as digits as its factorization.

172770661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851123.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 172770661 is about 13144.2253860773. The cubic root of 172770661 is about 556.9591351996.

The spelling of 172770661 in words is "one hundred seventy-two million, seven hundred seventy thousand, six hundred sixty-one".