766742221810 has 16 divisors (see below), whose sum is σ = 1380166658136. Its totient is φ = 306690075648.

The previous prime is 766742221747. The next prime is 766742221837. The reversal of 766742221810 is 18122247667.

It can be written as a sum of positive squares in 4 ways, for example, as 571449819249 + 195292402561 = 755943^2 + 441919^2 .

It is a super-2 number, since 2×766742221810² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365769 + ... + 1291228.

Almost surely, 2^766742221810 is an apocalyptic number.

766742221810 is a deficient number, since it is larger than the sum of its proper divisors (613424436326).

766742221810 is a wasteful number, since it uses less digits than its factorization.

766742221810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703277.

The product of its (nonzero) digits is 451584, while the sum is 46.

The spelling of 766742221810 in words is "seven hundred sixty-six billion, seven hundred forty-two million, two hundred twenty-one thousand, eight hundred ten".