1157405779505 has 8 divisors (see below), whose sum is σ = 1388935462272. Its totient is φ = 925892272368.

The previous prime is 1157405779469. The next prime is 1157405779547. The reversal of 1157405779505 is 5059775047511.

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

It is a cyclic number.

It is not a de Polignac number, because 1157405779505 - 2¹⁸ = 1157405517361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3885929 + ... + 4173158.

It is an arithmetic number, because the mean of its divisors is an integer number (173616932784).

Almost surely, 2^{1157405779505} is an apocalyptic number.

It is an amenable number.

1157405779505 is a deficient number, since it is larger than the sum of its proper divisors (231529682767).

1157405779505 is an equidigital number, since it uses as much as digits as its factorization.

1157405779505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8087815.

The product of its (nonzero) digits is 7717500, while the sum is 56.

The spelling of 1157405779505 in words is "one trillion, one hundred fifty-seven billion, four hundred five million, seven hundred seventy-nine thousand, five hundred five".