1243707670638 has 12 divisors (see below), whose sum is σ = 2694699953088. Its totient is φ = 414569223540.

The previous prime is 1243707670619. The next prime is 1243707670663. The reversal of 1243707670638 is 8360767073421.

1243707670638 is a `hidden beast` number, since 12 + 437 + 0 + 76 + 70 + 63 + 8 = 666.

It is a super-3 number, since 3×1243707670638³ (a number of 37 digits) contains 333 as substring.

It is a congruent 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, 34547435278 + ... + 34547435313.

It is an arithmetic number, because the mean of its divisors is an integer number (224558329424).

Almost surely, 2^{1243707670638} is an apocalyptic number.

1243707670638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1243707670638 is an abundant number, since it is smaller than the sum of its proper divisors (1450992282450).

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

1243707670638 is a wasteful number, since it uses less digits than its factorization.

1243707670638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69094870599 (or 69094870596 counting only the distinct ones).

The product of its (nonzero) digits is 7112448, while the sum is 54.

The spelling of 1243707670638 in words is "one trillion, two hundred forty-three billion, seven hundred seven million, six hundred seventy thousand, six hundred thirty-eight".