85951082970661 has 4 divisors (see below), whose sum is σ = 85951794978252. Its totient is φ = 85950370963072.

The previous prime is 85951082970659. The next prime is 85951082970703. The reversal of 85951082970661 is 16607928015958.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56653696728225 + 29297386242436 = 7526865^2 + 5412706^2 .

It is a cyclic number.

It is not a de Polignac number, because 85951082970661 - 2¹ = 85951082970659 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85951082970631) 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, 355822690 + ... + 356064163.

It is an arithmetic number, because the mean of its divisors is an integer number (21487948744563).

Almost surely, 2^{85951082970661} is an apocalyptic number.

It is an amenable number.

85951082970661 is a deficient number, since it is larger than the sum of its proper divisors (712007591).

85951082970661 is a wasteful number, since it uses less digits than its factorization.

85951082970661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712007590.

The product of its (nonzero) digits is 65318400, while the sum is 67.

The spelling of 85951082970661 in words is "eighty-five trillion, nine hundred fifty-one billion, eighty-two million, nine hundred seventy thousand, six hundred sixty-one".