61702121051 has 4 divisors (see below), whose sum is σ = 62395403400. Its totient is φ = 61008838704.

The previous prime is 61702121029. The next prime is 61702121081. The reversal of 61702121051 is 15012120716.

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

It is a cyclic number.

It is not a de Polignac number, because 61702121051 - 2²² = 61697926747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61702121051.

It is not an unprimeable number, because it can be changed into a prime (61702121081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346641041 + ... + 346641218.

It is an arithmetic number, because the mean of its divisors is an integer number (15598850850).

Almost surely, 2^61702121051 is an apocalyptic number.

61702121051 is a deficient number, since it is larger than the sum of its proper divisors (693282349).

61702121051 is an equidigital number, since it uses as much as digits as its factorization.

61702121051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693282348.

The product of its (nonzero) digits is 840, while the sum is 26.

Adding to 61702121051 its reverse (15012120716), we get a palindrome (76714241767).

The spelling of 61702121051 in words is "sixty-one billion, seven hundred two million, one hundred twenty-one thousand, fifty-one".