61442463621 has 64 divisors (see below), whose sum is σ = 104502067200. Its totient is φ = 31832579520.

The previous prime is 61442463611. The next prime is 61442463631. The reversal of 61442463621 is 12636424416.

It is an interprime number because it is at equal distance from previous prime (61442463611) and next prime (61442463631).

It is not a de Polignac number, because 61442463621 - 2¹³ = 61442455429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61442463621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61442463611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4328091 + ... + 4342263.

It is an arithmetic number, because the mean of its divisors is an integer number (1632844800).

Almost surely, 2^61442463621 is an apocalyptic number.

It is an amenable number.

61442463621 is a deficient number, since it is larger than the sum of its proper divisors (43059603579).

61442463621 is a wasteful number, since it uses less digits than its factorization.

61442463621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14591 (or 14577 counting only the distinct ones).

The product of its digits is 165888, while the sum is 39.

The spelling of 61442463621 in words is "sixty-one billion, four hundred forty-two million, four hundred sixty-three thousand, six hundred twenty-one".