61729200001 has 4 divisors (see below), whose sum is σ = 70547657152. Its totient is φ = 52910742852.

The previous prime is 61729199941. The next prime is 61729200019. The reversal of 61729200001 is 10000292716.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61729200001 - 2⁹ = 61729199489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61729200031) 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, 4409228565 + ... + 4409228578.

It is an arithmetic number, because the mean of its divisors is an integer number (17636914288).

Almost surely, 2^61729200001 is an apocalyptic number.

It is an amenable number.

61729200001 is a deficient number, since it is larger than the sum of its proper divisors (8818457151).

61729200001 is an equidigital number, since it uses as much as digits as its factorization.

61729200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8818457150.

The product of its (nonzero) digits is 1512, while the sum is 28.

Adding to 61729200001 its reverse (10000292716), we get a palindrome (71729492717).

The spelling of 61729200001 in words is "sixty-one billion, seven hundred twenty-nine million, two hundred thousand, one".