670121505 has 40 divisors (see below), whose sum is σ = 1203417600. Its totient is φ = 356755104.

The previous prime is 670121497. The next prime is 670121509. The reversal of 670121505 is 505121076.

It is not a de Polignac number, because 670121505 - 2³ = 670121497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (670121509) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 298176 + ... + 300414.

It is an arithmetic number, because the mean of its divisors is an integer number (30085440).

Almost surely, 2^670121505 is an apocalyptic number.

It is an amenable number.

670121505 is a deficient number, since it is larger than the sum of its proper divisors (533296095).

670121505 is a wasteful number, since it uses less digits than its factorization.

670121505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995 (or 2986 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 670121505 is about 25886.7051785275. The cubic root of 670121505 is about 875.0869051098.

The spelling of 670121505 in words is "six hundred seventy million, one hundred twenty-one thousand, five hundred five".