61005388501 has 4 divisors (see below), whose sum is σ = 61006009900. Its totient is φ = 61004767104.

The previous prime is 61005388489. The next prime is 61005388511. The reversal of 61005388501 is 10588350016.

61005388501 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 brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10582236900 + 50423151601 = 102870^2 + 224551^2 .

It is a cyclic number.

It is not a de Polignac number, because 61005388501 - 2⁷ = 61005388373 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 (61005388511) 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, 127386 + ... + 371803.

It is an arithmetic number, because the mean of its divisors is an integer number (15251502475).

Almost surely, 2^61005388501 is an apocalyptic number.

It is an amenable number.

61005388501 is a deficient number, since it is larger than the sum of its proper divisors (621399).

61005388501 is a wasteful number, since it uses less digits than its factorization.

61005388501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621398.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 61005388501 in words is "sixty-one billion, five million, three hundred eighty-eight thousand, five hundred one".