165521470 has 8 divisors (see below), whose sum is σ = 297938664. Its totient is φ = 66208584.

The previous prime is 165521453. The next prime is 165521471. The reversal of 165521470 is 74125561.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165521471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8276064 + ... + 8276083.

It is an arithmetic number, because the mean of its divisors is an integer number (37242333).

Almost surely, 2^165521470 is an apocalyptic number.

165521470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165521470 is a deficient number, since it is larger than the sum of its proper divisors (132417194).

165521470 is a wasteful number, since it uses less digits than its factorization.

165521470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16552154.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 165521470 is about 12865.5147584541. The cubic root of 165521470 is about 549.0578581208.

The spelling of 165521470 in words is "one hundred sixty-five million, five hundred twenty-one thousand, four hundred seventy".