65206137421 has 16 divisors (see below), whose sum is σ = 66098927808. Its totient is φ = 64318752000.

The previous prime is 65206137383. The next prime is 65206137427. The reversal of 65206137421 is 12473160256.

It is a cyclic number.

It is not a de Polignac number, because 65206137421 - 2⁹ = 65206136909 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 (65206137427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47909781 + ... + 47911141.

It is an arithmetic number, because the mean of its divisors is an integer number (4131182988).

Almost surely, 2^65206137421 is an apocalyptic number.

It is an amenable number.

65206137421 is a deficient number, since it is larger than the sum of its proper divisors (892790387).

65206137421 is a wasteful number, since it uses less digits than its factorization.

65206137421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2892.

The product of its (nonzero) digits is 60480, while the sum is 37.

Adding to 65206137421 its reverse (12473160256), we get a palindrome (77679297677).

The spelling of 65206137421 in words is "sixty-five billion, two hundred six million, one hundred thirty-seven thousand, four hundred twenty-one".