61621344434 has 16 divisors (see below), whose sum is σ = 102974661720. Its totient is φ = 27459909120.

The previous prime is 61621344413. The next prime is 61621344443. The reversal of 61621344434 is 43444312616.

61621344434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 41944268809 + 19677075625 = 204803^2 + 140275^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40862207 + ... + 40863714.

Almost surely, 2^61621344434 is an apocalyptic number.

61621344434 is a deficient number, since it is larger than the sum of its proper divisors (41353317286).

61621344434 is a wasteful number, since it uses less digits than its factorization.

61621344434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81725965.

The product of its digits is 165888, while the sum is 38.

The spelling of 61621344434 in words is "sixty-one billion, six hundred twenty-one million, three hundred forty-four thousand, four hundred thirty-four".