81214250836 has 6 divisors (see below), whose sum is σ = 142124938970. Its totient is φ = 40607125416.

The previous prime is 81214250813. The next prime is 81214250849. The reversal of 81214250836 is 63805241218.

It can be written as a sum of positive squares in only one way, i.e., 67707162436 + 13507088400 = 260206^2 + 116220^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10151781351 + ... + 10151781358.

Almost surely, 2^81214250836 is an apocalyptic number.

It is an amenable number.

81214250836 is a deficient number, since it is larger than the sum of its proper divisors (60910688134).

81214250836 is a wasteful number, since it uses less digits than its factorization.

81214250836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20303562713 (or 20303562711 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 81214250836 in words is "eighty-one billion, two hundred fourteen million, two hundred fifty thousand, eight hundred thirty-six".