143661227461 has 4 divisors (see below), whose sum is σ = 143665533792. Its totient is φ = 143656921132.

The previous prime is 143661227443. The next prime is 143661227477. The reversal of 143661227461 is 164722166341.

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, and also an emirpimes, since its reverse is a distinct semiprime: 164722166341 = 5659 ⋅29107999.

It is a cyclic number.

It is not a de Polignac number, because 143661227461 - 2¹⁵ = 143661194693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143661227261) 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, 2102731 + ... + 2169976.

It is an arithmetic number, because the mean of its divisors is an integer number (35916383448).

Almost surely, 2^143661227461 is an apocalyptic number.

It is an amenable number.

143661227461 is a deficient number, since it is larger than the sum of its proper divisors (4306331).

143661227461 is an equidigital number, since it uses as much as digits as its factorization.

143661227461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306330.

The product of its digits is 290304, while the sum is 43.

The spelling of 143661227461 in words is "one hundred forty-three billion, six hundred sixty-one million, two hundred twenty-seven thousand, four hundred sixty-one".