261166070 has 32 divisors (see below), whose sum is σ = 543005856. Its totient is φ = 89382400.

The previous prime is 261166069. The next prime is 261166097. The reversal of 261166070 is 70661162.

It is a super-2 number, since 2×261166070² = 136415432238489800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67961 + ... + 71700.

It is an arithmetic number, because the mean of its divisors is an integer number (16968933).

Almost surely, 2^261166070 is an apocalyptic number.

261166070 is an abundant number, since it is smaller than the sum of its proper divisors (281839786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261166070 is a wasteful number, since it uses less digits than its factorization.

261166070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139696.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 261166070 is about 16160.6333415495. The cubic root of 261166070 is about 639.2031668418.

The spelling of 261166070 in words is "two hundred sixty-one million, one hundred sixty-six thousand, seventy".