1115721477551 has 4 divisors (see below), whose sum is σ = 1174443660600. Its totient is φ = 1056999294504.

The previous prime is 1115721477547. The next prime is 1115721477593. The reversal of 1115721477551 is 1557741275111.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1115721477551 - 2² = 1115721477547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1115721477496 and 1115721477505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115721477251) 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, 29361091496 + ... + 29361091533.

It is an arithmetic number, because the mean of its divisors is an integer number (293610915150).

Almost surely, 2^{1115721477551} is an apocalyptic number.

1115721477551 is a deficient number, since it is larger than the sum of its proper divisors (58722183049).

1115721477551 is an equidigital number, since it uses as much as digits as its factorization.

1115721477551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58722183048.

The product of its digits is 343000, while the sum is 47.

The spelling of 1115721477551 in words is "one trillion, one hundred fifteen billion, seven hundred twenty-one million, four hundred seventy-seven thousand, five hundred fifty-one".