1243857156472 has 32 divisors (see below), whose sum is σ = 2719804284000. Its totient is φ = 533081637312.

The previous prime is 1243857156467. The next prime is 1243857156473. The reversal of 1243857156472 is 2746517583421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243857156473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226647613 + ... + 226653100.

It is an arithmetic number, because the mean of its divisors is an integer number (84993883875).

Almost surely, 2^{1243857156472} is an apocalyptic number.

It is an amenable number.

1243857156472 is an abundant number, since it is smaller than the sum of its proper divisors (1475947127528).

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

1243857156472 is an equidigital number, since it uses as much as digits as its factorization.

1243857156472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453300740 (or 453300722 counting only the distinct ones).

The product of its digits is 11289600, while the sum is 55.

The spelling of 1243857156472 in words is "one trillion, two hundred forty-three billion, eight hundred fifty-seven million, one hundred fifty-six thousand, four hundred seventy-two".