47720421765461 has 4 divisors (see below), whose sum is σ = 47720439407424. Its totient is φ = 47720404123500.

The previous prime is 47720421765413. The next prime is 47720421765463. The reversal of 47720421765461 is 16456712402774.

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 47720421765461 - 2¹⁰ = 47720421764437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 47720421765397 and 47720421765406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47720421765463) 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, 3817565 + ... + 10488786.

It is an arithmetic number, because the mean of its divisors is an integer number (11930109851856).

Almost surely, 2^{47720421765461} is an apocalyptic number.

It is an amenable number.

47720421765461 is a deficient number, since it is larger than the sum of its proper divisors (17641963).

47720421765461 is a wasteful number, since it uses less digits than its factorization.

47720421765461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17641962.

The product of its (nonzero) digits is 15805440, while the sum is 56.

The spelling of 47720421765461 in words is "forty-seven trillion, seven hundred twenty billion, four hundred twenty-one million, seven hundred sixty-five thousand, four hundred sixty-one".