61021700105 has 4 divisors (see below), whose sum is σ = 73226040132. Its totient is φ = 48817360080.

The previous prime is 61021700101. The next prime is 61021700111. The reversal of 61021700105 is 50100712016.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8472097936 + 52549602169 = 92044^2 + 229237^2 .

It is not a de Polignac number, because 61021700105 - 2² = 61021700101 is a prime.

It is a super-2 number, since 2×61021700105² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61021700101) 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, 6102170006 + ... + 6102170015.

It is an arithmetic number, because the mean of its divisors is an integer number (18306510033).

Almost surely, 2^61021700105 is an apocalyptic number.

It is an amenable number.

61021700105 is a deficient number, since it is larger than the sum of its proper divisors (12204340027).

61021700105 is a wasteful number, since it uses less digits than its factorization.

61021700105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12204340026.

The product of its (nonzero) digits is 420, while the sum is 23.

The spelling of 61021700105 in words is "sixty-one billion, twenty-one million, seven hundred thousand, one hundred five".