61351408605797 has 4 divisors (see below), whose sum is σ = 63466974419820. Its totient is φ = 59235842791776.

The previous prime is 61351408605779. The next prime is 61351408605827. The reversal of 61351408605797 is 79750680415316.

It is a happy number.

It is a Cunningham number, because it is equal to 7832714²+1.

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 32171198305156 + 29180210300641 = 5671966^2 + 5401871^2 .

It is a cyclic number.

It is not a de Polignac number, because 61351408605797 - 2¹² = 61351408601701 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 (61351408605997) 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, 1057782906968 + ... + 1057782907025.

It is an arithmetic number, because the mean of its divisors is an integer number (15866743604955).

Almost surely, 2^{61351408605797} is an apocalyptic number.

It is an amenable number.

61351408605797 is a deficient number, since it is larger than the sum of its proper divisors (2115565814023).

61351408605797 is a wasteful number, since it uses less digits than its factorization.

61351408605797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115565814022.

The product of its (nonzero) digits is 38102400, while the sum is 62.

The spelling of 61351408605797 in words is "sixty-one trillion, three hundred fifty-one billion, four hundred eight million, six hundred five thousand, seven hundred ninety-seven".