1243157043601 has 8 divisors (see below), whose sum is σ = 1356464855808. Its totient is φ = 1129898154000.

The previous prime is 1243157043593. The next prime is 1243157043631. The reversal of 1243157043601 is 1063407513421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1243157043601 - 2³ = 1243157043593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243157043631) 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, 12177505 + ... + 12279166.

It is an arithmetic number, because the mean of its divisors is an integer number (169558106976).

Almost surely, 2^{1243157043601} is an apocalyptic number.

1243157043601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1243157043601 is a deficient number, since it is larger than the sum of its proper divisors (113307812207).

1243157043601 is a wasteful number, since it uses less digits than its factorization.

1243157043601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24461303.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 1243157043601 in words is "one trillion, two hundred forty-three billion, one hundred fifty-seven million, forty-three thousand, six hundred one".