1249526246778 has 12 divisors (see below), whose sum is σ = 2707306868058. Its totient is φ = 416508748920.

The previous prime is 1249526246741. The next prime is 1249526246803. The reversal of 1249526246778 is 8776426259421.

1249526246778 is a `hidden beast` number, since 1 + 2 + 49 + 5 + 2 + 62 + 467 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1213396980849 + 36129265929 = 1101543^2 + 190077^2 .

It is a super-2 number, since 2×1249526246778² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34709062393 + ... + 34709062428.

Almost surely, 2^{1249526246778} is an apocalyptic number.

1249526246778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1249526246778 is an abundant number, since it is smaller than the sum of its proper divisors (1457780621280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1249526246778 is a wasteful number, since it uses less digits than its factorization.

1249526246778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69418124829 (or 69418124826 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 63.

The spelling of 1249526246778 in words is "one trillion, two hundred forty-nine billion, five hundred twenty-six million, two hundred forty-six thousand, seven hundred seventy-eight".