145948689961 has 2 divisors, whose sum is σ = 145948689962. Its totient is φ = 145948689960.

The previous prime is 145948689949. The next prime is 145948689989. The reversal of 145948689961 is 169986849541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127551836736 + 18396853225 = 357144^2 + 135635^2 .

It is an emirp because it is prime and its reverse (169986849541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145948689961 is a prime.

It is not a weakly prime, because it can be changed into another prime (145948689461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72974344980 + 72974344981.

It is an arithmetic number, because the mean of its divisors is an integer number (72974344981).

Almost surely, 2^145948689961 is an apocalyptic number.

It is an amenable number.

145948689961 is a deficient number, since it is larger than the sum of its proper divisors (1).

145948689961 is an equidigital number, since it uses as much as digits as its factorization.

145948689961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134369280, while the sum is 70.

The spelling of 145948689961 in words is "one hundred forty-five billion, nine hundred forty-eight million, six hundred eighty-nine thousand, nine hundred sixty-one".