1211561864148 has 48 divisors (see below), whose sum is σ = 2830586330880. Its totient is φ = 403338614784.

The previous prime is 1211561864069. The next prime is 1211561864173. The reversal of 1211561864148 is 8414681651121.

It is a junction number, because it is equal to n+sod(n) for n = 1211561864097 and 1211561864106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87136965 + ... + 87150867.

It is an arithmetic number, because the mean of its divisors is an integer number (58970548560).

Almost surely, 2^{1211561864148} is an apocalyptic number.

It is an amenable number.

1211561864148 is an abundant number, since it is smaller than the sum of its proper divisors (1619024466732).

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

1211561864148 is a wasteful number, since it uses less digits than its factorization.

1211561864148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22656 (or 22654 counting only the distinct ones).

The product of its digits is 368640, while the sum is 48.

The spelling of 1211561864148 in words is "one trillion, two hundred eleven billion, five hundred sixty-one million, eight hundred sixty-four thousand, one hundred forty-eight".