61672140321 has 32 divisors (see below), whose sum is σ = 90068858880. Its totient is φ = 37225742400.

The previous prime is 61672140319. The next prime is 61672140349. The reversal of 61672140321 is 12304127616.

It is not a de Polignac number, because 61672140321 - 2¹ = 61672140319 is a prime.

It is a super-2 number, since 2×61672140321² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (61672145321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8720775 + ... + 8727843.

It is an arithmetic number, because the mean of its divisors is an integer number (2814651840).

Almost surely, 2^61672140321 is an apocalyptic number.

It is an amenable number.

61672140321 is a deficient number, since it is larger than the sum of its proper divisors (28396718559).

61672140321 is a wasteful number, since it uses less digits than its factorization.

61672140321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8117.

The product of its (nonzero) digits is 12096, while the sum is 33.

Adding to 61672140321 its reverse (12304127616), we get a palindrome (73976267937).

The spelling of 61672140321 in words is "sixty-one billion, six hundred seventy-two million, one hundred forty thousand, three hundred twenty-one".