1123151642778 has 32 divisors (see below), whose sum is σ = 2507501348352. Its totient is φ = 332433889200.

The previous prime is 1123151642777. The next prime is 1123151642779. The reversal of 1123151642778 is 8772461513211.

It is an interprime number because it is at equal distance from previous prime (1123151642777) and next prime (1123151642779).

It is a super-2 number, since 2×1123151642778² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1123151642777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197874478 + ... + 197880153.

It is an arithmetic number, because the mean of its divisors is an integer number (78359417136).

Almost surely, 2^{1123151642778} is an apocalyptic number.

1123151642778 is an abundant number, since it is smaller than the sum of its proper divisors (1384349705574).

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

1123151642778 is a wasteful number, since it uses less digits than its factorization.

1123151642778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395754690.

The product of its digits is 564480, while the sum is 48.

The spelling of 1123151642778 in words is "one trillion, one hundred twenty-three billion, one hundred fifty-one million, six hundred forty-two thousand, seven hundred seventy-eight".