207950845661 has 8 divisors (see below), whose sum is σ = 223991986680. Its totient is φ = 191916122112.

The previous prime is 207950845637. The next prime is 207950845681. The reversal of 207950845661 is 166548059702.

It can be written as a sum of positive squares in 4 ways, for example, as 17696980900 + 190253864761 = 133030^2 + 436181^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-207950845661 is a prime.

It is a super-2 number, since 2×207950845661² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (207950845681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1536956 + ... + 1666773.

It is an arithmetic number, because the mean of its divisors is an integer number (27998998335).

Almost surely, 2^207950845661 is an apocalyptic number.

It is an amenable number.

207950845661 is a deficient number, since it is larger than the sum of its proper divisors (16041141019).

207950845661 is a wasteful number, since it uses less digits than its factorization.

207950845661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3208735.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 207950845661 in words is "two hundred seven billion, nine hundred fifty million, eight hundred forty-five thousand, six hundred sixty-one".