61622782378821 has 24 divisors (see below), whose sum is σ = 91416805801464. Its totient is φ = 39971348277120.

The previous prime is 61622782378769. The next prime is 61622782378823. The reversal of 61622782378821 is 12887328722616.

61622782378821 is a `hidden beast` number, since 6 + 16 + 227 + 8 + 2 + 378 + 8 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 50726088950625 + 10896693428196 = 7122225^2 + 3301014^2 .

It is not a de Polignac number, because 61622782378821 - 2¹⁸ = 61622782116677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61622782378823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133901691 + ... + 134361111.

It is an arithmetic number, because the mean of its divisors is an integer number (3809033575061).

Almost surely, 2^{61622782378821} is an apocalyptic number.

It is an amenable number.

61622782378821 is a deficient number, since it is larger than the sum of its proper divisors (29794023422643).

61622782378821 is a wasteful number, since it uses less digits than its factorization.

61622782378821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862261 (or 862258 counting only the distinct ones).

The product of its digits is 43352064, while the sum is 63.

The spelling of 61622782378821 in words is "sixty-one trillion, six hundred twenty-two billion, seven hundred eighty-two million, three hundred seventy-eight thousand, eight hundred twenty-one".