70665155 has 16 divisors (see below), whose sum is σ = 93430368. Its totient is φ = 50880000.

The previous prime is 70665149. The next prime is 70665157. The reversal of 70665155 is 55156607.

It is not a de Polignac number, because 70665155 - 2⁴ = 70665139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70665157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 806 + ... + 11915.

It is an arithmetic number, because the mean of its divisors is an integer number (5839398).

Almost surely, 2^70665155 is an apocalyptic number.

70665155 is a deficient number, since it is larger than the sum of its proper divisors (22765213).

70665155 is a wasteful number, since it uses less digits than its factorization.

70665155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12838.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 70665155 is about 8406.2568959080. The cubic root of 70665155 is about 413.4297948787.

It can be divided in two parts, 7066 and 5155, that added together give a palindrome (12221).

The spelling of 70665155 in words is "seventy million, six hundred sixty-five thousand, one hundred fifty-five".