1000438661461 has 4 divisors (see below), whose sum is σ = 1043935994592. Its totient is φ = 956941328332.

The previous prime is 1000438661437. The next prime is 1000438661489. The reversal of 1000438661461 is 1641668340001.

1000438661461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 1000438661461 - 2⁷ = 1000438661333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000438665461) 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, 21748666531 + ... + 21748666576.

It is an arithmetic number, because the mean of its divisors is an integer number (260983998648).

Almost surely, 2^{1000438661461} is an apocalyptic number.

It is an amenable number.

1000438661461 is a deficient number, since it is larger than the sum of its proper divisors (43497333131).

1000438661461 is an equidigital number, since it uses as much as digits as its factorization.

1000438661461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43497333130.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 1000438661461 in words is "one trillion, four hundred thirty-eight million, six hundred sixty-one thousand, four hundred sixty-one".