1213153557578 has 8 divisors (see below), whose sum is σ = 1820411636160. Its totient is φ = 606349678860.

The previous prime is 1213153557571. The next prime is 1213153557611. The reversal of 1213153557578 is 8757553513121.

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

It is a super-2 number, since 2×1213153557578² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213153557571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113543288 + ... + 113553971.

It is an arithmetic number, because the mean of its divisors is an integer number (227551454520).

Almost surely, 2^{1213153557578} is an apocalyptic number.

1213153557578 is a deficient number, since it is larger than the sum of its proper divisors (607258078582).

1213153557578 is a wasteful number, since it uses less digits than its factorization.

1213153557578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227099932.

The product of its digits is 4410000, while the sum is 53.

The spelling of 1213153557578 in words is "one trillion, two hundred thirteen billion, one hundred fifty-three million, five hundred fifty-seven thousand, five hundred seventy-eight".