1649987396836 has 6 divisors (see below), whose sum is σ = 2887477944470. Its totient is φ = 824993698416.

The previous prime is 1649987396791. The next prime is 1649987396843. The reversal of 1649987396836 is 6386937899461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1365252033600 + 284735363236 = 1168440^2 + 533606^2 .

It is a super-3 number, since 3×1649987396836³ (a number of 38 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 206248424601 + ... + 206248424608.

Almost surely, 2^{1649987396836} is an apocalyptic number.

It is an amenable number.

1649987396836 is a deficient number, since it is larger than the sum of its proper divisors (1237490547634).

1649987396836 is a wasteful number, since it uses less digits than its factorization.

1649987396836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412496849213 (or 412496849211 counting only the distinct ones).

The product of its digits is 2539579392, while the sum is 79.

The spelling of 1649987396836 in words is "one trillion, six hundred forty-nine billion, nine hundred eighty-seven million, three hundred ninety-six thousand, eight hundred thirty-six".