167772561 has 8 divisors (see below), whose sum is σ = 244032864. Its totient is φ = 101680320.

The previous prime is 167772551. The next prime is 167772571. The reversal of 167772561 is 165277761.

It is an interprime number because it is at equal distance from previous prime (167772551) and next prime (167772571).

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

It is not a de Polignac number, because 167772561 - 2⁶ = 167772497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (167772551) 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, 2541976 + ... + 2542041.

It is an arithmetic number, because the mean of its divisors is an integer number (30504108).

Almost surely, 2^167772561 is an apocalyptic number.

167772561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

167772561 is a deficient number, since it is larger than the sum of its proper divisors (76260303).

167772561 is a wasteful number, since it uses less digits than its factorization.

167772561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5084031.

The product of its digits is 123480, while the sum is 42.

The square root of 167772561 is about 12952.7047754513. The cubic root of 167772561 is about 551.5357200645.

The spelling of 167772561 in words is "one hundred sixty-seven million, seven hundred seventy-two thousand, five hundred sixty-one".