1211610644461 has 4 divisors (see below), whose sum is σ = 1384697879392. Its totient is φ = 1038523409532.

The previous prime is 1211610644459. The next prime is 1211610644473. The reversal of 1211610644461 is 1644460161121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1211610644461 - 2¹ = 1211610644459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211610644461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211610044461) 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, 86543617455 + ... + 86543617468.

It is an arithmetic number, because the mean of its divisors is an integer number (346174469848).

Almost surely, 2^{1211610644461} is an apocalyptic number.

It is an amenable number.

1211610644461 is a deficient number, since it is larger than the sum of its proper divisors (173087234931).

1211610644461 is an equidigital number, since it uses as much as digits as its factorization.

1211610644461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173087234930.

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 1211610644461 in words is "one trillion, two hundred eleven billion, six hundred ten million, six hundred forty-four thousand, four hundred sixty-one".