1261387970748 has 36 divisors (see below), whose sum is σ = 3188827070520. Its totient is φ = 420420645216.

The previous prime is 1261387970743. The next prime is 1261387970761. The reversal of 1261387970748 is 8470797831621.

1261387970748 is a `hidden beast` number, since 1 + 2 + 613 + 8 + 7 + 9 + 7 + 0 + 7 + 4 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1261387970748² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261387970743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1384138 + ... + 2106801.

Almost surely, 2^{1261387970748} is an apocalyptic number.

1261387970748 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1261387970748 is an abundant number, since it is smaller than the sum of its proper divisors (1927439099772).

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

1261387970748 is a wasteful number, since it uses less digits than its factorization.

1261387970748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500986 (or 3500981 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 63.

The spelling of 1261387970748 in words is "one trillion, two hundred sixty-one billion, three hundred eighty-seven million, nine hundred seventy thousand, seven hundred forty-eight".